Malicious PDF — malware analysis report

Static analysis result for SHA-256 d616a792936b3f76…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 04:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc474c8d1b649bea878155fd933e3247 SHA-1: 837021a6e5586ef1be10ac64b0af2173a8dd7b75 SHA-256: d616a792936b3f769c6589f1eb2eda1f5979df9a43dd506cf99a16fe9c0a0506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting an attempt to obscure the final destination or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tropo-design.com/ckfinder/userfiles/files/jelanabewinatapixo.pdf In PDF document text
    • http://ginzaramen.us/uploads/files/jerusasifikuxifuxopim.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/bapulutenapuxo.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///kajafapasibob.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb0627b286---nikizibizopopedixabok.pdfIn PDF document text
    • http://intertribo.sk/files/68608032146.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929da03b75c---8382431186.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/55283459645.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/0j9h8aj7ge8m6iqjpgpu8q3vj8/11199818919.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vkldlr0qmcckg20cbmmturbqp1/reloxabalenujulomu.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/xekubidetibijebadifo.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/wuxiwaguwiverokizo.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/79126236656.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/684612c231eb53126cece3231130bfcd/13879939372.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/72420554111.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/367276800.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/votifanagedesinom.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/52953371997.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/fikubawibedukaperarem.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/fekomomevuladobuxepuraga.pdfIn PDF document text
    • http://indemo.pl/Image/files/61878964146.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/26398306661.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/41507580516.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ju594c35p0pdjfamh8e7dnrhd4/babisuxur.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/surojizititi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hs+code+for+luggagePDF 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_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 17800 bytes
SHA-256: 91abc10e6242a374abb048192729f50bc5da58e3b595ee8bbdf6dcd85bf4536f
font_01_sfnt_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13302 10448 bytes
SHA-256: 486b1dd1329613575b6e5d500c69c5f972773e29adb9fc066393bc1e0d88783f

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