Malicious PDF — malware analysis report

Static analysis result for SHA-256 c010640df25ba5ac…

MALICIOUS

PDF

84.4 KB Created: 2021-06-28 11:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 089a9aa4bbff379c5ae33707284a7617 SHA-1: 0660f5c30f27e64bf4e25fdff4aa8aaa26bbb11d SHA-256: c010640df25ba5acffba4c1a67b499ac486975fc86c60effc8dea861be4c2a67
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e471f1cc5afe028627f85a34677ddf89/88854138200.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d2b7febbadc33b3dc21301ec04014069/bonudubavituzamuxeda.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9aa34d8a2---2385569449.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/54gj3ta0io8icu6anj03g1ou77/2696899428.pdf
    • http://uralinteh.com/uploads/files/96398390598.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0303e8af32---39044674826.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140719367a---70065601226.pdf
    • http://valdhans.cz/userfiles/file/59421514267.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/c51tncosk05ol5tgot19p3ocmt/matukikabijixadokazuno.pdf
    • https://agmatbaa.com/upload/files/getewenumanorure.pdf
    • http://allycatering.com/userfiles/muwonuwaponolim.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/vitotipovub.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c666d7fc2---nuwalojezazadamosujarago.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f1340328c49bc8cb4b990414a4d9baa0/50700920616.pdf
    • http://abnicum.com/files/file/gumugetisazolegosix.pdf
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/rukazigeno.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c1153338ec0ee259321857f9b5602955/nobikujadigurutaraxomupir.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceafb07cd2b---50127025822.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7767b200d---59752081791.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a984fd59d0---bixodekobotogixep.pdf
    • https://daynexweb.com/upload/ckfinder/files/37766393641.pdf
    • https://asthasupermarket.com/userfiles/file/botabofujidukopaxepot.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tax+withholding+calculator+2020
    • 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_off0000e77b.bin
e7b50b57d19cfa4c70a3c43c60857a902d34851fa9ef94d90e78bff000ac0bd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 10840 bytes
font_01_sfnt_off0001005e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 16792 bytes
font_02_sfnt_off00011870.bin
2698b374e38017753bb06952e3e7590aa7f9807ef35dcedcbea515641b533391
pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 16904 bytes