Malicious PDF — malware analysis report

Static analysis result for SHA-256 37850841fbe7e351…

MALICIOUS

PDF

89.9 KB Created: 2021-07-27 18:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3869fa20d508f636fea2458b2e76a91a SHA-1: 23f60a12072ad4d354a5da65a7a50a33c1b38f5b SHA-256: 37850841fbe7e351a1eadd57aec029801aa108499d9d934753a762a8d554d08a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting further PDF files. This behavior is indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f8135eac3---32026067859.pdf In PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2437c45c9a6f8551d76f93dfd275cab6/54147410084.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/bedovegalesaxokavotof.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ba0c8738d7e39de5cb28a2bb0da95d41/94477128175.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2eb1ec52---jomerusaxujumemuvewo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b007a02d044---xoxavidenupebofe.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8fc322d786adfc660fb8d4c4b29ccb8f/jozalemojodefazage.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/6im9abdmrlo6ae5qg3ptlorj9v/debukexukusobevo.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/88343381969.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/141db6225ae1a581a27e9c0214f5a62e/bidot.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/miladufu.pdfIn PDF document text
    • https://quaint-house.com/lujuwenawenedetuwux.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/l9u1at28qffu6l2ujbp735o3t2/64453268250.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/31845154782.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/31958145973.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/dibafukutofib.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ae66de6418ca10b6e84437452d1bd9fb/29082003511.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/jebuj.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607587668449b---54586349315.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lu8sui44bumgq0o7f6h7l8r8a5/gelikano.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/nenujumidaxib.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/63286722261.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb004b11cb---68854548840.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/taralodutozotemugile.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624530619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+does+plastic+deformation+meanPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 17332 bytes
SHA-256: d87a8403195723cda406b5c3f83064a2e6c228032df47180347bf3e464252ade
font_01_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001403b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403B 10880 bytes
SHA-256: cbd907d1e75b16043df03fcfcbb4ab1badbf08e14ba1507616913cd541c5d744