Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47f154c9afd15af…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 13:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d44039f453c444b99e1d0fceb24ba466 SHA-1: 011afcabdde1a01b8323478b11aa83983c5263e7 SHA-256: a47f154c9afd15af9ac6b252911c0dd2cbd6f14e8f3084cb9debdf8e2c0bb2ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, characteristic of a link farm designed to distribute malicious content or phish users. The embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jirehenl.com/userfiles/file/260138265816.pdf In PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/51419146797.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/kalozawufudofet.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/bejojakuw.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/57054086681.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/49475780818.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/vuxojosowug.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5434dc874c44e74a95ed05308f031785/51879671820.pdfIn PDF document text
    • http://canoeing.by/pics/files/rutapexax.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/nulotigufux.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/36004734637.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/refiti.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0756d34073---877877174.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5eec09b7c61cbe235a2cce4cede0f593/melibiwixorukabut.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0202095fc3---27007898229.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/3980829275.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/rujowamugopejodevagabubo.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/28573009968.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6390ce46dc281df75ca2cb0eab7db4c3/dajiviwinewabikaperi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8668475fc---zuvezogabofeku.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93b821f04---76716704912.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf09220794---pojenusatijoxusogewajodis.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/33834c98815e22224a9f79fb68dece94/76789281950.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/fh5hgk6l3sueta8j4eat519a91/31428493825.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1040bc9fe4---12060548724.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/88647028013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fast+and+furious+7+tamilPDF 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_off0000b4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 19088 bytes
SHA-256: 87bc69154e54fafcdb7e3a2f48d89752d12d5ca78aed95b39c2b0ae8e19bf3f5
font_02_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 10512 bytes
SHA-256: bd3f58bda2c9d7cc89301c01b5fcbe98b351d6cd2ae7dd8f1dd3beba721ec8a5

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