Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa35b92f0348c909…

MALICIOUS

PDF

73.4 KB Created: 2021-06-29 14:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a52f2332ac500f46e52048aea7c60cbc SHA-1: cdb0cd18402f51254a57c950a45d1e3aa96f2aff SHA-256: fa35b92f0348c9092314708dd257831715d2134d51db962134204d3c9afe81c0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous URLs, many using UTM parameters, reinforces the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=bicep+and+back+day
    • http://vervesimuhub.com/userfiles/file/85887629551.pdf
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0317d8d1---32668482522.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4af4450da---fafeligu.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba17d69196---36193526290.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f60f3248c---jogorakiter.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/laboleveji.pdf
    • https://ce-mi.pl/uploads/userfiles/files/bonolot.pdf
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/rakurebapinuzenuvit.pdf
    • http://sochisushi.nl/survey/userfiles/files/zerukofovolejasagawunem.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/0anf7jv0igl3t1dm18arq15bp1/72825619223.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/51b31869cafeb6b9be6a3e0c28a48ee1/buvegajawoseziw.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/517aea407d1cf0c7bc3f9513dbc6d562/teruvarimagudejafogaxevo.pdf
    • http://vencedor.coop/images/admin/file/vekedepijal.pdf
    • http://arniestribu.com/campannas/file/sanivupadi.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035fc2e018---voberasu.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/rifisirexezos.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/cb2510e00192d2d345766ac34c06b6d3/33691875705.pdf
    • http://taiyoaquris.cn/upload/userfiles/files/20210529203351.pdf
    • https://biovuspharma.net/userfiles/files/mexakemuxozule.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e3eb0f8d7---bigukuxapupofiv.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f42f1b3f4---21527845572.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e9ba2f9ab---saluwanutuzetixodiwozu.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ff9b6e816---46480685667.pdf
    • http://travelport.pl/userfiles//file/rojofoti.pdf
    • http://trimblehighalumni.com/clients/84492/File/fajuferumuredonurenok.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607570ebe0ceb---takateroxi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf1c.bin
4f2aaae0425328bc69bfd41edad25936c111a513afb2d22c25ee66eec0fa1797
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1C 16144 bytes
font_01_sfnt_off0000e90e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 16792 bytes
font_02_sfnt_off00010125.bin
4c8f7655decf28ab8d24d8e66ff9724c9b127c16720e02e47eca68aeba8e689c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 10372 bytes