Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7accd3940211ef…

MALICIOUS

PDF

73.1 KB Created: 2021-09-07 17:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ba946256f694c413cd78d59c8a5be7c5 SHA-1: a13768a4f1afa7363ed160f9f6286d5866a0b7d5 SHA-256: 1d7accd3940211eff8cdfbb76723c6a0968610930c9ef4630fdfd79b3f56fabb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to external sites, many hosted on compromised WordPress installations or disposable domains. This pattern is commonly used to distribute phishing lures or redirect users to exploit kits or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://inwebjor.ru/uplcv?utm_term=aprilaire+4655+manual+digital+control+humidistat PDF link annotation
    • https://voyageaventurenepal.com/upload/files/kerorugijejuvubexob.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a915c2db1---76695741950.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/ronapesomebikap.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6613dd8807b2a702234a4d74f0c3cdda/tezub.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ca9ngu8ckiir31jqab42etjaai/43751809133.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/zebuz.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160725e1b21e7a---69162498318.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/10372674241.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/57703994732.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/59941831740.pdfIn PDF document text
    • https://icfas.net/icfas_new/dev/ckfinder/userfiles/files/vutesaji.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c38e229363f---ximodunonanotirezuduvele.pdfIn PDF document text
    • http://adveotec.com/img/file/9758751524.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/71849006240.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/rixopupexevumeziripa.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/df6pigbauhtif5ta7f79lm0pp3/59565861427.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/48180575448.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/35533652003.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de2be3e087---67822244698.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160869c2e6ef1c---87560933099.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/5933614803.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/duduzitasavijugeg.pdfIn PDF document text
    • 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_off0000b945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 16564 bytes
SHA-256: ee96e1de437bd309a12700c9fabbd9c1c55d5fe0cda95243454f9850b5449182
font_02_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 11424 bytes
SHA-256: bca1a5e783d6e72dc61cb2aaafcaf209a23b361aa418a21b2df3b85c069cd30a

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