Malicious PDF — malware analysis report

Static analysis result for SHA-256 b885c3c487e8eb55…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 11:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b7c73ded42a9d2e23ba6ad1304d7b54 SHA-1: b4c9209b9b3c6aae2546536c3354cfee71a33a5e SHA-256: b885c3c487e8eb5563bf1fd61b3325debd8db68b8e4301cb6608d373b6551e61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://denge.aero/upload/files/bapagabar.pdf In PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/55864701578.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/jeravaginavemex.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/5426910865.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/zetomoxaranubijewinukume.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/lulufuragimufuvu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d2087e300da1726ad01a2a33e6642cd9/pakalas.pdfIn PDF document text
    • http://markone-tools.com/upload/files/vimumug.pdfIn PDF document text
    • http://metapolar.hu/tmp/26694474024.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613583bb8575b---59422211939.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/venezomok.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/fuxonafufakef.pdfIn PDF document text
    • http://fohow77.ru/upload/file/36860994093.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/tumotokakip.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b453fed7641f26579adf833c28198b67/wubetemisuwawomozu.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/gobej.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/zagufunofodelefuwa.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/95336739035.pdfIn PDF document text
    • http://lecostationery.com/files/file/kipajib.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133eba693178---tiveludawarivoxuxe.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/15710980456.pdfIn PDF document text
    • https://afayl.com/userfiles/file/rabujudo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ccf95d830---4946027155.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/86136342506.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/69695884283.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/42317572042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=206+bones+name+in+human+bodyPDF 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_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 10936 bytes
SHA-256: d7e3285f3927c73d85e4a53b5bcb283c9039cd250e2e32ea07ee61ce5d697c40
font_02_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 17300 bytes
SHA-256: 84f11d839041f8e0c8f52b5c11663606dd74effee5caabb1a9561e7d44f4a9cc

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