Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79c2620246a3504…

MALICIOUS

PDF

75.9 KB Created: 2021-06-26 06:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2c3c38ed3cdef3cc64c3937a830b925 SHA-1: 6d789a8a9734c28de21305cf7e3d4ab92210fdec SHA-256: d79c2620246a3504fcd71b6543e5e6305237f7dd90cb406740f73acd000091d6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and appear to be part of a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5100

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1c4193eb---79160088540.pdf In PDF document text
    • https://perfecthospital.net/FCKeditor/file/vupivanekaf.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/28a92c2290aaa9f7a22799f9b5ca2743/24008667382.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/a163ed43d466de241aba2741f0cc4c30/67382563602.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/50522131355.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/5c36ebfeda8cdde942c7134414175c9b/jelukixu.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/rakuji.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rmu8m7kve98gga4kflls5eemac/diremawipugefazoto.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d680e6afa1cb400af642eaabb8a2ab55/sabedaluzojubodumirow.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/76742890831.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/14671971115.pdfIn PDF document text
    • https://webmenuplus.com/images/file/gafilifu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/tgnn7se79r8af18pfoj1ects73/sidudini.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/29595584383.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d16903137---794633539.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/biwukuzozu.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/9ipm474bfl9k0fas0l6f50kj0g/20346529453.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/t94ucga5p215gkjpjjbvvncrk7/53907629878.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/88vg570eg72rm9al6omt82h023/zipimaderaxerurarefil.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/gazuwawinop.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/7932c012368d9a47004507a5d49a96ea/49836808182.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/b2n6eqrpn2d09sc66o8tem7c6h/58442600779.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/lanusonekurenufixav.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/37581678442.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bb902549834fedd5a774e43ab5912c1/figixogizemotemosozu.pdfIn PDF document text
    • https://corghialberti.it/file/58460842214.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a27525946fd---44585841052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hollywood+audio+songsPDF link annotation
    • 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_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 16232 bytes
SHA-256: 338cc954a946a7fbf70b29c55d5e66db99b2ef151e94d540d22e7b387f44db23
font_01_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 10384 bytes
SHA-256: 55d9d79171cbd357b757f84ec3c06f24415dedc2bfc2fa3d6cdfad7dfc585750
font_02_sfnt_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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