Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49d157f912e3971…

MALICIOUS

PDF

86.5 KB Created: 2021-06-13 08:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6cc4c5a8bac5aef19c8487ccff72ac8 SHA-1: 216e921b57947b5d94d09bcd3e8e85b16ee0f805 SHA-256: a49d157f912e39716c3a722e3b1b8c363d5bbcfaf2f599779d0b012ab3131686
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of multiple external links, including those hosted on compromised CMS uploads and disposable domains, suggests a phishing or malware distribution attempt. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=female+voice+changer+during+call
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210516024332.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/9aefub0kv7a6cuprh8v5gkk8qh/53184377199.pdf
    • http://angelescare.com/userfiles/file/5096047805.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607089570a569---39003507650.pdf
    • http://ridendo.cz/files/file/lataz.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a151f79b08c0c20279cb0380d0467f89/jagamugexobusufinapiwob.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/udjlo7mu79javnvgl9n76s316p/julelugodikakavurere.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd7fb3c43---23697306590.pdf
    • http://ashioke.com/images/library/File/110011381.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/vewotokimilabezeruritofex.pdf
    • http://mu-rrrc.com/userfiles/file/fodalu.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba633e813---12794027851.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7b97d82bd7c8f39e27c2dae70878cdbf/13033846932.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ebb42cafb225bbe12725065e0da83bc5/juxaneru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010632.bin
b3fc2c4b41840a161554116035e9df1d7222c061b64e3d82f3a2a6e2968c1152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 4992 bytes
font_01_sfnt_off000116fb.bin
877cee77135ac2cebbc6d97115b0c2c50c6b46169bcaf09b25545c840884814c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116FB 11192 bytes
font_02_sfnt_off00013d18.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D18 4324 bytes

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