Malicious PDF — malware analysis report

Static analysis result for SHA-256 db77cec98bb3496e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 21:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40cfb0b2370e1565aba320ad50e727c1 SHA-1: d42411200414810e413517cba09cc7e8518b745b SHA-256: db77cec98bb3496e2ec44f196f8e0f08e4005110a2f714223a809324190ced23
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, some hosted on compromised CMS platforms, indicating a malicious intent to redirect users. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document likely prompts the user to call a fraudulent number. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=2+floor+house+plan+3d PDF link annotation
    • http://seychelles-resort.com/images/blog/file/14261626462.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/4510569056.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffae76732c---59659241713.pdfIn PDF document text
    • https://italvaping.com/file/ronupikejolurakozodufe.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/41251263374.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/80901125776.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/98749031281.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410c60c5352---pizamoxevalanavaxi.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/2259265503.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/48281811078.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/28592229437.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/samifineta.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5213b7f8---gewojobifab.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac483092a---vobogunovogabujisapu.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/kodowekagapi.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/tagitidevowizujik.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/fuzujez.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_CDD7D3386B2CFFEF.pdfIn PDF document text
    • http://torgoborud.org/images/file/gosadutokalavafaronomekof.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210913224200.pdfIn PDF document text
    • https://aashianarealty.com/file/76455385486.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/sepodibitezululo.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/95318435597.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/lhjbmmr1vis85t6d3j2t3hlhe7/bonifer.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/76896552170.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/minifovobu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 10700 bytes
SHA-256: 35a8eea4a70a8d23e8963141f68bf1e22e19c83bbc6e95a11b6f90f311efa26c
font_02_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 17492 bytes
SHA-256: dc8f43c2b61bd8594c89b40f8a46e16677fd9f1a17ab703878251ae0e8b91263

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