Malicious PDF — malware analysis report

Static analysis result for SHA-256 42aa084c58282b7b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 06:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e900723f812c2cf558445c183cbd9fe1 SHA-1: 9de7dc5779a812483820d7a012970669a3f915db SHA-256: 42aa084c58282b7b619d17c7f9b539af65c42e2dd3c80dbdfa8f54c82226acc5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. The document body is unreadable binary data, indicating it does not contain user-facing content but rather is structured to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6kdrvlgekpafok42cs9uv3lpp8/83127858521.pdf In PDF document text
    • https://istanajp.net/contents/files/64215904079.pdfIn PDF document text
    • http://m2m2design.com/userfiles/85115146667.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/nojevuvafupit.pdfIn PDF document text
    • http://shshalloffame.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/79569654230.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/17242209744.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/52b7afebe83f5cba17abb474399c4f93/49986105745.pdfIn PDF document text
    • http://weclassof86.com/clients/6/6d/6dc59c75684a9be5e3a4726337e2fa3a/File/39017718063.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/59478548456.pdfIn PDF document text
    • http://chinahongji.com/d/files/zomudajeloxapuvonexunow.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/rorununeba.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/baligolejux.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///guwinoperigonazugewo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6f83ccbba---42140845241.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/002oot2chfd42n8ovr47q9o8k4/dazamiwezosapedepa.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/fupilovigilifanerabebud.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/63984210109.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/dotegife.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/3dc0bbcf952e5bf7b4ee439163628f5c/vadugebebobukimegono.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/e7ac432f79ad5f88c4e7440ab57cc527/55208772946.pdfIn PDF document text
    • http://aweibel.com/Photo/file/75920002698.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b2c449809---69800046416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=impressora+em+pdf+gratisPDF 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_off0000cb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5D 17868 bytes
SHA-256: cb8f3301add890a68d561d3102fe07adaec5aaf6bb4b171d1b045220e3990e46
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 10640 bytes
SHA-256: e1e10d611cb5d56bdd9bb81b5183980802503450c9f12a168195fdaa2ffb17ac
font_02_sfnt_off0001115c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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