Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13babe8bd932d00…

MALICIOUS

PDF

84.0 KB Created: 2021-06-29 10:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9654629c78a439a677ba728a1e3b794b SHA-1: 799dffbfee7f0f2f4db9dc9f3a0bbf883616bbd1 SHA-256: f13babe8bd932d0099b6a9e9d97182a568336a3c84eeffe35d1324eb755d393b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading users to compromised WordPress upload storage or disposable hosting. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic point towards a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607296443bd33---2521580213.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/86284e51572e4f19c879e42e3cacbc5e/47404396656.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/39904152606.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/26007937618.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2ae30ed903fa0fbdca0a6192fd6e3ecc/koker.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5382767472aefa9f6c0af971770f1f84/pajajazapurasap.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/27606811127.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/fivakagewosa.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8e314e769d9850e4e63b18df7219413/kativepifi.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/su58bo52d7o0aq8kq4jouaelg3/kowepenigarosezevipotavux.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/66609910755.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddeaa580c1---gozezet.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/u7o2ubhp62a0og04brga2jc7ns/40869020218.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb4e41dd7---19163852531.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/mowaxolawam.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f63a824b---kejeluzolowatomazewewa.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/d2cesc4kpjui3tqnugf4thr8k2/nijemigur.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/240ifk32cq3dl27r9qhdkfg483/96214453052.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4e0a86045---85549272538.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/uusafea518mh9fn7uverh2sct3/33772211216.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/vipul.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/9gv3olpskqdk2pn0fnvnkqobf7/31380070203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sources+of+educational+finance+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_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 16804 bytes
SHA-256: bf7b8c910d755039beb08d1774f26efcb9116ac8cee7ebe3555612589880adee
font_01_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 10788 bytes
SHA-256: beb0ec379b58b9cd0d14c893dca811d30c2e92cd21979c8275a70026ba80b761

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