Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f11ae931c52a1b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 10:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea08fe3d3e7cbeccd04755b777415f0a SHA-1: 7061a6814b8b933750fad90206f39d29174e525d SHA-256: 44f11ae931c52a1bd051742ed7a60ce467913e6336e6461f72ac40daa546b290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a malicious PDF designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=android+save+contacts+to+sim+card PDF link annotation
    • http://mopron.ru/upload/files/gupuvuma.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/natugugel.pdfIn PDF document text
    • https://felicityokolo.com/file/fawobesugopekelija.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/15925818357.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/20551222497.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161348366bf768---mibukifapimolinab.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/lopamitadubetugupu.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/lifudov.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/tesakutefap.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/19944389830.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/wuzate.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/vamalifu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca68750673---vitenosidaxojesenusov.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/93655bd1bcff86a29bffcbd416567f12/devozoxe.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b41258fdb---50380122075.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/mokelu.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/11674960715.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/sinukifa.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/d37d8e06ec1abace9e6c708a5ce78d02/pifiwisuv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e857ab3ee---zawija.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109112107249962.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/xasuguved.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/zogaduwidodikuvuna.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/29718889696.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 10532 bytes
SHA-256: fb713574e8cd5be308762f9c623985214f833d8563a51e0b282f5934dd58107c
font_02_sfnt_off00011697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11697 17616 bytes
SHA-256: 61986e2fff0c2ca075e1bfd4d00ed7bb9fdf8437eb2b97d4cc54835f64de04f8

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