Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28e9e9c96fa56ca…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 13:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58eefcfd507e56ecb287b2f7c9818eab SHA-1: 1867503c41e44fbbb9b44e64517468feb3495b13 SHA-256: a28e9e9c96fa56ca19303f91a07e1ccf8dec7c943eeb547a54747acb72c6e138
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smsenerji.com/resimler/files/pokexilevut.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebfb63ffa---23995426052.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a2f294a83---94078793677.pdf
    • http://frankifoto.com/uploads/pages/files/roxugesoluvesupepasemij.pdf
    • http://escritacontabilidade.net/fotos/news/file/65373453978.pdf
    • http://redskap.ru/userfiles/file/28848303532.pdf
    • http://grupposcorcia.it/userfiles/files/16069769153.pdf
    • https://luminex.pl/upload/file/90913016880.pdf
    • https://inprovit.com/ckfinder/userfiles/files/54134289422.pdf
    • http://taispacedesign.com/upload/files/51085573425.pdf
    • https://mayersoffice.com/userfiles/file/91486816874.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/92d0e885892e0632eac33456e1f69f2b/juraxoxumoxumarexe.pdf
    • https://ymvii.com/admin/upload/files/59148278940.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0e2b937c---89060090544.pdf
    • http://prime42.ru/userfiles/files/wikugevob.pdf
    • http://chieucoingason.vn/files/tavatatato.pdf
    • https://wic-net.com/userfiles/file/70344122161.pdf
    • https://shibbirs.com/media/files/gupakarokunumusatitaxi.pdf
    • http://puisan.ru/uploads/file/94072171474.pdf
    • http://mxag.com/upload/browse/file/84693630989.pdf
    • https://muguet.fr/sites/default/files/file/39831183032.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=12+angry+men+screenplay+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcaf.bin
3ac93d0ddccd5c25ce5b2d9f6082c65e73c7d2052cfea6176b5ca3572bf64628		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 17408 bytes
font_01_sfnt_off000109d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 16792 bytes
font_02_sfnt_off000121ed.bin
8d6f08ccdd0a1be68c47384c2d44baeb1de754da2990cc4727e586d88bc85f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 10840 bytes

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