Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d117557483f268e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 00:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e86053b0201ab52bbb425ee8f2bafcb SHA-1: c746651e958e47ed257215b09d999adc8c9066cc SHA-256: 4d117557483f268e1dc53797a6500146858765685e5a175879b3eb825046b486
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a raw IP address in one URL and the detection by ClamAV as 'Pdf.Phishing.Trojan' further indicate malicious intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://arcdesantmarti.com/biocop/Images/images-editor/file/sujijazojajokodod.pdf In PDF document text
    • http://ztkammer.at/uploads/file/86030961161.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/lolurevufanudurexu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0387bdd35---lekulezaxaxuferujenavoz.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/dinirugikatifaf.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/nadokazewatoz.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/72615774521.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/25186546974.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/zulutuwenuji.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/bubolidutojufexiwimexa.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a2eb9e470c042725c6b2e68c9f5273a0/lopopisujo.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/zadimozisabuzisit.pdfPDF link annotation
    • https://kuzeyilac.com/resimler/files/maturivifalikatifexavip.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4839ffd3---sagawozexa.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/42126414044.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/vemodejudinegewidig.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/xigis.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109060610213878.pdfIn PDF document text
    • http://brlairport.com/images/file/54847736756.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/lumusulufona.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/fagijezizitu.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/xamulegewiveko.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/reseregupoposupibig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e54d419ad---30319073569.pdfIn PDF document text
    • http://www.bash.cl/media/file/26625405626.pdfIn PDF document text
    • http://szcftz.com/upload/regufupalizosexurepise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=jak+przes%C5%82a%C4%87+kontakty+z+androida+na+iphonePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 18056 bytes
SHA-256: 0e41c207900adee3798930c90deb4f17ab933157d0c3acf133c8661284d7ef4f
font_02_sfnt_off000129af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AF 10908 bytes
SHA-256: c76446a2a501e9857c1ae225491867b9b633532f44b752dbe010d656bb69e186

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