Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c80f61b6865565…

MALICIOUS

PDF

101.2 KB Created: 2021-07-16 16:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bf1cd1aeaece1d204a9289e7dd0d26dc SHA-1: 38fc13b93306e64af2e7acf63e72f9dd637d369f SHA-256: f1c80f61b6865565d661ea7611d7a61f647eed6c2d30fae8566785674471170b
156 Risk Score

Malware Insights

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

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 functions as a link farm, directing users to other PDF files hosted on compromised CMS uploads and disposable domains, likely as part of a phishing or malware distribution scheme. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://newabel.com/ckfinder/userfiles/files/72584826149.pdf In PDF document text
    • http://toyotalongbien.org/data/dulieu/files/xuvumemul.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/45048052086.pdfIn PDF document text
    • https://music-group-store.com/upload/files/wevutijunomutoboluxaki.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/d422cdf085c461df0a823b464f9f2b80/zatasizexoxumuxudulurag.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b283ad158a863ebde3cd394a7548d574/95938876735.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/fuguvigalepalonigajaz.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/94579118403.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/274d6685895576fe6c5e927fc449c4f6/79595867390.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/19541751335.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2d8e90d15---davikerogororosexapi.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kolos.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/22759180612.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/goxuligaxijokegavubok.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/49750019104.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/85473761765.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/28715187839.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/51395362333.pdfIn PDF document text
    • https://hssanesteban.cl/files/64906896130.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/d0756915a00e6162c38c7329e17149ff/29382535322.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/66303362927.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b8d7a00e1---tesujalitelidivopitav.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5757d562d1eb3cb20f07147385899663/31356080297.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/pekawasopisi.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/27048428677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+heart+forgerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C0 17484 bytes
SHA-256: cbd0491d8d6de6217996cf1f969c707ae3f19f5f06722229415290934addb982
font_02_sfnt_off00015349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15349 10044 bytes
SHA-256: 19fe9ff7fe48a10b6e4730732767422afbdb5b4aab77db9466465834c512c8ff
font_03_sfnt_off000169c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C8 19312 bytes
SHA-256: 90aed816f91a8692524de154bae049721e44a669ae6374a68c23b8819288a769