Malicious PDF — malware analysis report

Static analysis result for SHA-256 471c57c6658773c8…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 16:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2979ae110218c309ea00e07a152b4d57 SHA-1: be3268fae56b5f61a4ef976b49a3af7431f1fe78 SHA-256: 471c57c6658773c8140897b5a8a1c297ba24686e2f6d17b2ecabb925cb2e2b50
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues, but the heuristics and URL patterns are sufficient to infer a malicious link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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=du+battery+saver+apk+2020 PDF link annotation
    • https://k-newsletter.com/ckupload/files/malanomidanif.pdfIn PDF document text
    • http://gysanya.com/upload/file/210902125845225623vd3fmdnjwk4c.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/sekotuvilivewa.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/47354392696.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b801872033cc447dd648b4c0071e0d8b/30627790837.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/vatage.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/47246691051.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/salanalubofejete.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/jogisijazewutoxiwazutaw.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/18945521505.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431742c6e24---gilozizerekudon.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/89655952543.pdfIn PDF document text
    • http://hodori247.com/uploads/files/81234592185.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/wapajuzutodesul.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/rafukolesalaruvadekum.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/xuzire.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/77194215562.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161317ebc35335---ronovonaputomaweg.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/rarerudexoroke.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/81427637624.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/48424841846.pdfIn PDF document text
    • https://fultoys.com/userfiles/46149953722.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9tqafc2fpdl2q2kbl3glos4si3/9573626435.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///11772386962.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/90692437821.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_off0000c727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC727 10640 bytes
SHA-256: aa913afff5b9f443f83c8d91914be1d11d7163f3a3f78cbc78d9809bdd1925b6
font_01_sfnt_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 19776 bytes
SHA-256: 368ecb53359aa1e0f1ebd4c9e7ce7f3b5d7fc82e5590b5eb249f01cbc1919c73

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