Malicious PDF — malware analysis report

Static analysis result for SHA-256 c641b0e01cf4673f…

MALICIOUS

PDF

67.2 KB Created: 2021-09-17 16:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2739803730d56821359b97f9c6c83631 SHA-1: 8f490e3d79784ce5b83872676a3d8a0f0f729d84 SHA-256: c641b0e01cf4673f24c29978e7bac7f339420fa7f6f57cf42c6bf340e96634ea
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-based overlay and numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or download further payloads. No scripts were extracted, but the presence of multiple URLs indicates a strong likelihood of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=web+series+ke+liye+app PDF link annotation
    • https://tradingcall.in/ckfinder/userfiles/files/voxezijo.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e72e5b549cee1de944b4b254679fef89/jexofaroxanejomowosun.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/3888024013.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e395a19bcd---beraleduze.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/26110593920.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/16641895817.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/14722598930.pdfIn PDF document text
    • https://seikai.jp/free_images/files/82068998337.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9a4f7947052696fb7b87ed7bed6c1d8e/50310856568.pdfIn PDF document text
    • http://kftchem.com/upload/files/fidelalafobud.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/lobog.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/51343150771.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/zibotidarabasonasizu.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/tamaresabapomobuget.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/73697454809.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/12930337222.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/93409a0618a0bcc5b3b4cb9b7ae407d8/53636049008.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/39319391067.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/60541994849.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/bederimigabizivubul.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/lovoxebilavedepog.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/28776918687.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/28131321811.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_off0000ae10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE10 10260 bytes
SHA-256: c7927e2805ea8e793e2d3118ccba3a50e65f9a7b436b40289e38d48ec9b90925
font_01_sfnt_off0000c509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC509 14032 bytes
SHA-256: 2ed971c8fd0fd84602e919770394e42f59428013076a8f95aa5f84142ed59162
font_02_sfnt_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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