Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cb17f8c179b056…

MALICIOUS

PDF

88.9 KB Created: 2021-07-13 18:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5a60917e3bd2e0510ab7d56ad8d6a23c SHA-1: 4d1f105650f5487465bfdcc30230500715edd6d9 SHA-256: 34cb17f8c179b056ec030643f25e410aa085004d208621df7313c5600da0e0d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing lures. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://philabc.ru/uplcv?utm_term=harry+potter+reads+percy+jackson+fanfiction PDF link annotation
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094af711f2c9---17516726608.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/2df35c0411f2b3e850324df3b2567e6d/selesogitex.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b4e6cca2e699b7c6ce03c79319f0de76/nizudedowunijamejobesobav.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/tepegopogenos.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/zikafu.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/lurewezemen.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607940a231b8f---mixibomanominilapex.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/84807806523.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d181cade220---waxobemizutetafefomono.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/babovabe.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/71695753824.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/94487319639.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/rajidanaxifogido.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7cb940d6a---88437196495.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87f390d42---32999640078.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ec9a5adfa---83499279485.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e7a0a1691bbbca07442ab2e30b77a0b3/rinadavopazosegabiwo.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/96763679017.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/e587edd2026e1eb530d2c1d9da0b10a0/widuk.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/i9a6tle6o6cgubupfit7ks6i5l/44646211730.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/tuxokaditudakapepasib.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093c215bda2f---64197219903.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/levujimumitibavekulavizag.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070cebbe1514---duzotulowibexoduriwexepi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc32c160c2f---dazatopesevebogi.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_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 10896 bytes
SHA-256: a1dfe5768aa1b5f301da2de6801c081797ef4f780c8ff65962fc6ff74fe4914a
font_01_sfnt_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001299e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 17100 bytes
SHA-256: e792f61d5d02088267359da90303fe54fec6cd82dd578aa00c8ad0a5cca04365