Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7665fa7790f7d98…

MALICIOUS

PDF

89.4 KB Created: 2021-07-07 08:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cbb2057f4ce283b6df45dfac525723c1 SHA-1: 2769f764c3626924d15ad4a4725c410b84ca2f4b SHA-256: f7665fa7790f7d98e5d3179f5c70781a9255627ce128231594e0aa9598b07215
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, identified by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The embedded URLs are the primary indicators of compromise, suggesting a campaign to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://aqbnb.com/uploadfile/file/wufirudimidikekifutaleka.pdf In PDF document text
    • http://innospectrum.eu/hirlevel/file/sewexozami.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/43010726883.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/55256726011.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/65762943936.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/vuwetofumezemif.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/631mnvf4msn1ircfrktf9miri1/59700374263.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/fibonolifodokizipelu.pdfIn PDF document text
    • https://kuepancong.com/contents//files/safimofidikinaturor.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/aajnejboe2fv8fnroteq7t59d7/gezuvage.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607525f71aa9c---juwamizenolet.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/medefivozetokelim.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b52ca93ce9144e963994021732fc83ef/53035106145.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/kuvowototifibinu.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/12585154625.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/pixunetisefedaritun.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fd6023c26---lijolitabi.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/0ebe0428bb1f568ce4231e2cd48e6d9c/70001054379.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9kshqknmffcbrekpvffg64ltlj/kuvijab.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/mamogixuferadorawu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qe467er47b5vnv2r39qrj5437p/nuzazetukirolaxobar.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/wepulomi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1119d0185---68466086857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sq+ft+price+to+build+a+housePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 16768 bytes
SHA-256: 0f9ebfa955166ee0e7bb61165a699b085ff14a80030441c5b4f32b510be2b4ba
font_01_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F43 11072 bytes
SHA-256: 9a9e5b432a209fe1badb4625acc39fc55323ff2c5da71d39a2e9878662a7e0bc

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