Malicious PDF — malware analysis report

Static analysis result for SHA-256 44778f2fc0defdf6…

MALICIOUS

PDF

85.6 KB Created: 2021-08-13 17:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6087ac50076911c99adf3f40bed2cf9f SHA-1: 0028b30d700ee521022e2f7ae2af03a9c55ac9bc SHA-256: 44778f2fc0defdf60f6a35c7e6da9efb9bcbf8fa409a6865724c87932fb8b4dc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and the nature of the detected malware point towards a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2ba493246a9073d96ab41e6498015238/meresemumirovogevazofasit.pdf In PDF document text
    • http://goldenpeak.it/userfiles/files/fikajujarazasujuj.pdfIn PDF document text
    • https://clinicaveterinariacabianca.it/file/33310030618.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/64b7878dfe70ae695a8a6d7648b1b6cb/tolasazopezawevazeju.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/welageziberuz.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ffd8696eff9ca3e354959a13a64d6f0/93506683809.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/vedalebofutosan.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/0fdbc5eb794295c814ba49c5eaea9c14/vagobosixafuretuwuxoto.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/81802100397.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/d48a41384ce99198c40288c84d1a762f/45311923393.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c6bb2904---25826020871.pdfIn PDF document text
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/gipakekiner.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610734437520c---duponazexejuvapomolapalo.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/76176089006.pdfIn PDF document text
    • https://yuss.it/file/33223345988.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/474493185097bfa4bce3bc6cc2f728c5/10833011467.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b2033e047bc377f0af1ed453a181fefa/53635347222.pdfIn PDF document text
    • https://bursac.net/userfiles/file/31373920968.pdfIn PDF document text
    • https://afayl.com/userfiles/file/68177940117.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f97e1d58f7a---92264350449.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/pubixujuvejilufiboguvawu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161102f387d25c---29138309125.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/mel43q6j1t3lnfv3k47h95nah2/zakusajara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=internet+cafe+business+plan+pdf+philippinesPDF 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_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 16872 bytes
SHA-256: c1903ed648d93e8c58b8787028083b36f279cbd4e8ba352a713748df783a533c
font_02_sfnt_off00012fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEA 10788 bytes
SHA-256: e166936c39d0805b6197225a709e23c44cc2973680c532055510f3ff34a1cf8a

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