Malicious PDF — malware analysis report

Static analysis result for SHA-256 59599e99de35e533…

MALICIOUS

PDF

93.9 KB Created: 2021-07-04 14:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7f79b14b8ba6718de3a7f3c4de7aea02 SHA-1: 8afbc041e4c73bff3bdb1361251864e22572d0de SHA-256: 59599e99de35e53377d8ddf4583166f33ebbc65a74052830bef01d279f3a2381
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Several heuristics point to the PDF containing a link farm pointing to compromised WordPress sites and potentially disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while not directly executable in this PDF, are indicative of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hersheyhigh1981.com/clients/37302/File/leriwo.pdf In PDF document text
    • http://musorcentrum.hu/files/article/file/92961765622.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9eee545f3---gefofegad.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/zetesibemoletipitunubunul.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/a3675c278e0d2e9fcb963a2f71281d8e/gizokodezofilor.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/6156683597.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94bd35a2d---68651686799.pdfIn PDF document text
    • https://defaico.com/d/files/lunedinupexiwegemugepo.pdfIn PDF document text
    • http://didula.com/img/file/ripefib.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/36872e1488738b5d7781dfbd4c8a4576/monezezuworegiwokikuraleb.pdfIn PDF document text
    • http://dearbornshs70reunion.com/clients/c/c6/c6cacd1d9512a3effe7244eb89d69e0e/File/viveli.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/jfd63ea23q288h58afeouahhba/rewobageximojazigiripu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f465225ed---ropepurelanoz.pdfPDF link annotation
    • https://arzhosting.com/calisma2/files/uploads/63599428758.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/76485912678.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0f44f04ce08ab6998a458de514bb0443/47654098021.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/25e3ec404bb34c3baf6b669b8e8af775/riwewasovuzigugipavuvami.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ch8setsd3vof284752m2c4a0cg/5542758057.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16094a5660986a---64814972007.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/86212700844.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/71416796680.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1d6d2ebe9---vixufaragorozuruzubo.pdfIn PDF document text
    • https://giustofiori.it/file/32786425991.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7905eug0r09aj630gvv366t03q/voxodosurezunakogega.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/kekexenebijibovetipimik.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836285c5488---54297962036.pdfIn PDF document text
    • http://coffee33.ru/archive/file/bilakugiforezevudek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=all+alone+on+christmas+home+alone+2PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 18944 bytes
SHA-256: 3a8148f03643d3d3471038c2ea13eab2cf83dddb18b96acbe17a3ea2432e1113
font_01_sfnt_off0001224d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5E 16120 bytes
SHA-256: fc96bb51e68212267b34b5acefce01e3ce1e469c7be8c0a453211fcdfa4f682a
font_03_sfnt_off00014fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB2 10596 bytes
SHA-256: 00c6d1f2bc86c23532782bed41051aaad9d42a86db695882c6b98e89cd869e3f

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