Malicious PDF — malware analysis report

Static analysis result for SHA-256 37eb9e7fb5369468…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 05:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a626352c115b390af5248cf392317e0 SHA-1: f66729b45e9747f38a2eb0a24223f88b22f07dd3 SHA-256: 37eb9e7fb53694689a0ef8ff91b16626b07a90b776a73faf57054e6c5d8d0277
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The document contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an effort to distribute further malicious content. The presence of embedded URLs and the overall structure strongly suggest this PDF is part of a phishing campaign, likely using a callback lure to engage the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c98cb305777---78573689629.pdf In PDF document text
    • https://kodcomputers.ro/2664/uploads/65540102544.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/sotesexevevawanoraredugo.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105252045367068.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b402079b7a---21460669163.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc5b5bba46920f1152e41918701107ae/37916489308.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/14636839375.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/rudujilab.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/91311865803.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/64658721285.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/78076844788.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2dd6ff55---joxuwiwufarurutarux.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/47219e1cf1353a12800871249fe0dee9/dexogemilufixetusumetogak.pdfIn PDF document text
    • https://purefeeling8.com/data/file/nuwatuwutosigapimomuzepo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/40259779450.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/57510568320.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160d02da4a5619---85296461601.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/3fa311909376e50759a3ed580551ec7f/salafede.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/94479335943.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062915460770554.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/44410417143.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/42262711176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=most+useful+word+shortcuts+pdfPDF 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_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 17932 bytes
SHA-256: 055d155d569b88da77514887050698be354180507fb761eda0d2dcaca3110059
font_02_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 10540 bytes
SHA-256: ac20c7717725198529db143116acc58e2603cb6fcdf1a36023a16f1f75e92a76

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