Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40232e10fb857cd…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 11:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dca621d4110e2eeff4f48091eda3212f SHA-1: 37ac8b2447cac411044d20ba0ded76d07d467778 SHA-256: c40232e10fb857cd83776764b2d12855e73778f946e725cb9c806e6b525424dd
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple suspicious URLs and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=twilight+streaming+free PDF link annotation
    • https://rafautama.com/uploads/file/wikuxiziwirike.pdfIn PDF document text
    • https://tpk-m.ru/files/file/sawepazariwunevibubufufi.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/zilub.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/namezunifezonekoki.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/begumepedobesix.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/36610255712.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/42921263665.pdfIn PDF document text
    • http://i-physiology.ru/upload/57590718589.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/16262ff3edfadf238939fadca729a37e/dobata.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/belegejaxobosebejanis.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a794f0cdcc17b391a096037211a2be3a/47155599219.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/dotiwurapenek.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141c4c5a0b1c---vegarip.pdfIn PDF document text
    • http://metallpress.ru/files/senanebixit.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/litabibedevupilelulil.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/24432413354.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd97eee12---46721554986.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/joxesatewuvakamisidilaz.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/fogipejidenezapopixo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc54e1344---45429761503.pdfIn PDF document text
    • http://limoride.net/gallery/file/fewawinupifituzuvefeneg.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/16193218386.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/7ee9074dc6fa4853a3457f4eedfa5f2c/mipomisutevujadobamakuved.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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 16560 bytes
SHA-256: b20cd8e47c8597d7d45e208fd76b564d36cd0cb326c415150cede337481ab650
font_01_sfnt_off00010d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 10592 bytes
SHA-256: d27b416813cc34fb7127bc9dae46458a52d4c834ee888f71577c23ec07c3e69d
font_02_sfnt_off00012517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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