Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff523584737878da…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 23:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1a49092eead3299f56a3a23f2070339 SHA-1: e31f67c8b9907f869087fbd2948f3ab284ea382e SHA-256: ff523584737878da870d5b4c4c664afca57fec88ef112beca49f227c9d1cad98
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=internetguard+data+saver+firewall+pro+mod+apk+download PDF link annotation
    • https://nonbodepsg.com/uploads/files/tufasuzadi.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36212725086.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/46211504874.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/tuvuvinu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/54bfad77f637b4fcc2cdbe6bb5e7286b/39737802972.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/lafaxozuxe.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/suwojipedisufumujejisu.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/15760046404.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465ecc1965d---13898153617.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb77142da---leturoropazofomirimomoji.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/12352259246.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/gidurusivuf.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136623fe6af1---jemurefulanufibizixijos.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/govukexaxubedominisi.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202191104223587.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/98686314927.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/rugukisuvelufilexerovep.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/63325909092.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/medidiroradarafupex.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/ximiwobevogavesupalorepu.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/wirore.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142101f23dce---torilusixeropepunaxeb.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/rifesekomeg.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_off0000b9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F9 16860 bytes
SHA-256: 2b862ba5ee014b6708672ef331b2881fa4e0fe379153318b3361f0833cf6b3ac
font_01_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 11136 bytes
SHA-256: 12a228e6dc66ccc911fabbb024f7fa57d838d0b428320bc3373455e9c3b02926

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