Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4baa05e640f656…

MALICIOUS

PDF

152.6 KB Created: 2021-06-30 22:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3ca8b43b86a19b89c850f84bd1c42f5f SHA-1: 6c735020d693dc385831db340a5dee51a73b1f1b SHA-256: 3d4baa05e640f656f8b54011a1edc755e4a1b90ab0d4a20e184737d281f88030
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites via a link farm. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://laborke.ru/uplcv?utm_term=mastering+go+2nd+edition PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f1358beac33b2049fea2973e6820d550/55246893396.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3b173c4022484e9155ac455c84a263cb/jowazeketuf.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de3d91ddd---50886058944.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/zajurepi.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/54367339465.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607253293b1ef---20972663074.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591994c9c3---jutijuvefezuganugoni.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/57991739220.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/72504e8c5af99c3acafc976a09ecf7ac/6228751178.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/m1fdpa98eqb3rcv843f1pcbtc5/piwatadiximuvexurob.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/lowogakowiraxikef.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/k8elbdse4sdscgcnupate7gc65/95724587388.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0fd323789---raridasabenimaba.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b449844028f---zitoma.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/juwalenavirutexejejejako.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/86065668842.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/41d392e76e3f13143c6e1ce49daaf131/wifelufivivepabon.pdfIn PDF document text
    • http://medica-brno.com/files/79804523971.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6a76391318fedfa4f34dff57da0c3f99/29611574841.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830bd7db002---jusizarogusudewejafemofup.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/26076880019.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ef8cd98aa08174069bd25ce557ddb631/46770472714.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/g422ktvqup2l964sto788v2nsc/xiwisideja.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/91017678156.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B02F 10492 bytes
SHA-256: 5392736fe483363dd44a4235bc8f335d7419b9fc48d4dfeb1f52e4fe43a40e3b
font_01_sfnt_off0001c802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C802 22912 bytes
SHA-256: cdd63178f771ab961d51c9a4a0e420eff3ec94c482c588b0156b715ac8f52fdd
font_02_sfnt_off0002091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2091C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2212E 18244 bytes
SHA-256: bef2df9243ca95ab43a14a5e97d6e2d74704a60c3e439be686057d6c20042f3e

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