Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2fa1266368627f…

MALICIOUS

PDF

85.4 KB Created: 2021-07-10 06:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7cc173babff26b79821e71d31451c0e SHA-1: 859210ad5ad1a25e4319b34493bf9b624c498afa SHA-256: 4c2fa1266368627f04b9dffdcf926c1a1f13518aad55592c8987136ecc24cf46
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dongfangguohua.com/ckfinder/userfiles/files/111728991.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/83a951a1303daacd60fd959075b5ca66/82245824214.pdf
    • http://vinacafe-dalat.com/Images_upload/files/lifubaxuluxinafojakefuneg.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b04edc0f60463f92bf5a8cd16d2fd93a/dekisux.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/14534695258.pdf
    • https://datajournonepal.org/files/zugitasomijewadowi.pdf
    • http://canvangdientu.com/images/file/bikedugulovuremobalosik.pdf
    • http://kovacsoltvaskerites.hu/images/file/16996468991.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7ef60f78---27252504063.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2df336308f7034401c09c116fb628fdd/87203289762.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/pewujoba.pdf
    • http://auxerretv.com/content/public/file/26048047368.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/815efdcd6781bb02cd18bf290a1b523d/22430574070.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b567564d8dd---82118238405.pdf
    • https://bestofbucerias.com/upload/file/kiwitu.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa086a67c9f---samupukut.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad890d2e497---jutapezoj.pdf
    • https://bem-sa.com/img/file/darabato.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/zonesabezen.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c854ce05728---regitojupel.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8efbf72173---99592332094.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/101e06999a632c71e8c29b164fd32e73/18318052470.pdf
    • https://lasanisports.com/files/wunizumeluwazovidatebuj.pdf
    • http://lungshingcentre.com/userfiles/13880547919.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=would+you+still+love+me+the+same
    • 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_off0000eb0d.bin
3e52fbf2e9a870bc9e58bdbf7bcf2eb3778350961e029b6b7561ea62c2138e94
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 17184 bytes
font_01_sfnt_off0001180e.bin
703a266d41080e632380a43c2a2c1fc6f4ca7ca553bf492d267bcdfa9f6640f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 10584 bytes
font_02_sfnt_off00013047.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13047 16792 bytes