Malicious PDF — malware analysis report

Static analysis result for SHA-256 102a62ce7821cf97…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 16:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22beb57247eef8de30b48c16a2e82936 SHA-1: ee78915c7c746893401933cb2e132af45e9f2d11 SHA-256: 102a62ce7821cf975fd5f4be02aae48c27d96421d69fb60e59b4f7b0e62506b6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, potentially leading to further malicious content or phishing sites. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a fraudulent phone number, a common tactic in tech-support scams and callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://giga.sk/storage/file/81399902474.pdf In PDF document text
    • http://riccaassociati.eu/userfiles/files/wirisusubutofoz.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/84249540156.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b006ada5782640419a244587c11ce14d/wujano.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/143d476f85ab92b24aa9cfcd60a413d0/27979993583.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8b8605fd98ab2ba0879df0d62d267654/kajuma.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/mukes.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/kusoretawopamu.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/lokezofozo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7d43dc42d---vuvetasepazudo.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/89315386258.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210830_969CCDB46E62FE1B.pdfIn PDF document text
    • http://teraval.cz/res/file/mugasade.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/10927377296.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/tifatiduxutaxolifum.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872f2ea51bd---kuxefogopux.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/lefepenafudijakibaxi.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/71897688341.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/46aa746ce231a3bc48b4af86749b588d/vojamifofotak.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/80167115982.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088044f77b37---rusirifidisowozosekekifas.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/15350784666.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/68533429744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=janome+mylock+744d+overlocker+manualPDF 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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 18812 bytes
SHA-256: 6dabdd53358a2f0699f6fee8d8d95d1a09739af049bd1c9553051f2a48c9f49f
font_01_sfnt_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D0 10664 bytes
SHA-256: bb54f7eb8f887ea659a5cc82b2f0274033cadb8c968c9c0a10944839332642e1

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