Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fab2f9bcd9b6be3…

MALICIOUS

PDF

101.2 KB Created: 2021-07-19 11:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cc5d9757fc02992a0763123c60941655 SHA-1: d588f6c414819442d207bee438289143c23cd22d SHA-256: 9fab2f9bcd9b6be3635f11a2ca11ef05377c7728629e416b5d25f80be6978cfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf2e0ea2787f0a17ac52a0f0f407d718/zinetiwa.pdf In PDF document text
    • http://2ds-creations.fr/userfiles/file/nozulolefof.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/80392800477.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/mavibovemuputekalokidivux.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/34782074860a511c83fb06.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/damavufakanefibupevomo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca066650c81---52884451229.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/75636954908.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/64030244232.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/47739593763.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/mameradumunepije.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/kizipanetelarurev.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/jukukovozunagipepo.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/70008006421.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/86363279373.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/09b3a1dc5dd341d5149a8b58723289db/31241128441.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/gttl06tbgj9pv83m410p0enain/47825010197.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba96e0ed39a---17518183170.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/453e5d6c9b624a614f9faf5dd496b940/linesiriginiraledasarij.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/webuv.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc49d65b7a---75805623345.pdfIn PDF document text
    • http://envigest.cz/upload/file/zelitewogavojagudavulibe.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210715155537_cl3ez4.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=god+of+war+ps+nowPDF 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_off0001250e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D20 19664 bytes
SHA-256: f8cdaee24e17abcf17852349c4a9270aceeaf19d404dc017c11762429e965e68
font_02_sfnt_off00016f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F07 10248 bytes
SHA-256: ee189d8c703f9a4d8399279c9eb029646ebe8032a1f2213c221454fce55714d0

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