Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f6b2746854e53b…

MALICIOUS

PDF

112.2 KB Created: 2021-07-06 20:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ef23c240a3fa8300551f178fbb3bf4dc SHA-1: 875f62d1b4599b3a64bf7587ba2365bbdf549918 SHA-256: 31f6b2746854e53b6a0668ca7d7ef5e73c46907be792d2252242462efb842c41
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9718

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://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c4453a50da8---dedoxoje.pdf In PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd5d43e8818143a47e444b9bcf0535c3/gimawag.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/24410163013.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/58012564030.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/vopngm2o04mntrqikjhe7bpe5s/13402346670.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jh2gebbmf4l0gncnk037nj469u/33868783759.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d356d2ac29---98609644997.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/28317839930.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/92300966744.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/fa5b501e261bbc5e2a73fe20e7849d49/62012379966.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/vatakegokarok.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231d9a0acb---wiked.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7114d7f4bb---roxakoganaratuparonudejuf.pdfIn PDF document text
    • http://asvpp.fr/pdf/18933840778.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/70562102422.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093e95464274---jabogav.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b7696a40e5a---vakuvazumeleremitamugag.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/v943rkd545mo1ai5meairlj5p3/29791533264.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/jaladijetikefepovegerisa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d426c91d51---97859842099.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210608074453.pdfIn PDF document text
    • http://zuche0551.com/upload/file/sefas.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/jijisomovaxaledawaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+proximodistalPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016534.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16534 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off00011fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCC 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_01_sfnt_off00012d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D47 22736 bytes
SHA-256: 4f2e603f6e6f549a7e5c063b1c7ccaa872a97cdd223e8ba9e2003da6ae507fa3
font_03_sfnt_off000182d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182D6 10516 bytes
SHA-256: 8ef22acb215b840609617c1b518b2681855b247425837afc454c6a081b78a801
font_04_sfnt_off00019ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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