Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1db018daf67a77…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 14:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c88ec0d2c86b41965260ef97ab99245e SHA-1: c2ace84d5214d47ffa5ba1b06c6986fbb4411990 SHA-256: bb1db018daf67a77c3492481c3d976022237b3eaa916164e8cd055df9e8a2f7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, including compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farm heuristics suggests a phishing or malware distribution attempt, likely using the embedded links to lure victims to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5517ed4175444a33db242651ed81b960/gowifo.pdf In PDF document text
    • http://hdg-gmuend.de/userfiles/files/samominakenowex.pdfIn PDF document text
    • http://roocenter.ru/upload/file/falisegemedu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/33e75bbb974862a3b1f5e1fb4b8e00b3/4113197975.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/roronamigi.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/kafaji.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/f26sa5mlmv9md51n4s1t23b9g5/gakajusitigiwalonovop.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/23207137162.pdfIn PDF document text
    • http://www.moyekolodin.com/files/87728683374.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/005287750f926fee723ee07750802653/rikim.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1609a68a8---24522952366.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/lusimugirap.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/22021843477.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/3799125423.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/3246940851.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f74dcec16f---kijowovevubifarijiwafo.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/55966598930.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/93436732490.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/tatipaxe.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/fupuxadotuzuvapilowubilox.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/70837497998.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210911155950873168aagnw.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/84803155088.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/235549449.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/45281781204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=magic+home+apkPDF 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_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 17852 bytes
SHA-256: 4fb16e7b045a362a1426206c5e890ec9b0093233311c57f521cdaf9cd14eaf0a
font_01_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BB 10388 bytes
SHA-256: 02f9d98d00fdea5aebcc478a4eca5062d0452c41a741f59f2215c40cc83a3749