Malicious PDF — malware analysis report

Static analysis result for SHA-256 772e8869f80c4abf…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 05:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 400e2d3c1b744108b85bc7e6336725c0 SHA-1: 91bcf86ae2d6a91e2d0b0904f4278c77eb9e79e6 SHA-256: 772e8869f80c4abf6680d1d947511ffeac468a20dfcf2fdad5fd867599b4e227
156 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The embedded URLs and the nature of the link farm suggest an attempt to exploit user trust or search engine optimization tactics for malicious purposes.

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 http://zkqzl.com/uploadfile/file///2021081601125118.pdf In PDF document text
    • https://chezgregoire.fr/userfiles/12601139538.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/xawabefejavamefotera.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/65ac23fd4c715c9a83531eba9350f7f6/jolixibamapaxuxogeneguz.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/50b1bc18b47516357392e548ae79cca3/44884143688.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/77853911181.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/vosatuzoratenarufalo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720a0a0db27---22553379149.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021060113421776.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/bisitelovelazuwajum.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vsp4pghrtvojf1vb67suefr0qn/nikepujivodosuraxumajes.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/23629921483.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a290f1adc2---64016787725.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1af29eec---36875517379.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611141d3cfe7c---10189827055.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b60790f65a---3262110627.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ea4eb5e4b---34532773524.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/66866898467.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/josoxodeje.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6b0c59a33---wufekedonosizepo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6fca5f2c---muwuki.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/89310516016.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c542b421a---32097796117.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/41442673989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=vacation+ownership+sales+training+pdfPDF 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_off0000c2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F0 16524 bytes
SHA-256: 74579569d1e59e5a5de5db0645e2c0796654bb9007304162b2699c1c7a20aff8
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 10952 bytes
SHA-256: 57e62bc74d3abac182adf1fd34e3102a7674f1d4d39f9009d3b98d1859f403ce

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