Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d53c776e815d81f…

MALICIOUS

PDF

70.0 KB Created: 2021-09-02 11:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbdfd0deb67faf47f32d3894e6d4b4f8 SHA-1: ba893d863e840a66ada9d05da23890ff384b28ec SHA-256: 1d53c776e815d81f6c849731c896112029fbfc9731ebe7f28487a11972ca53a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics point towards an attempt to lure users to malicious sites.

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 https://smidgel.ru/uplcv?utm_term=convert+pdf+file+to+powerpoint+free PDF link annotation
    • http://expertsystemgroup.com/file_media/file_image/file/besaj.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/rabopavufopowoli.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a638a2132---sovetuwelemere.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7946b37b8---resof.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/waworerafa.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/dasuwek.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ffe89cb221e00113856c3914bf077498/buzosaxe.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/fba729b54132c502183040ec66d75830/fixopezoxanifop.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/43282fdd2fd70d34083546ff7ff4673b/pewajudofivafubula.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/rotorojof.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/86d6cc13b00a07c3dcd795ed70318e27/82363930746.pdfIn PDF document text
    • https://naves.cz/res/file/97221177654.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/8833488516.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c3a5d0045b80b74ac42432803c726f46/55332024700.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021082106204373499.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3b2719d0eb7f36e4d28a1bc89225a609/tojiname.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/fosawewogawe.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/kudijurajaf.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/femasofibaviv.pdfIn PDF document text
    • https://grancom.by/upload/docs/155805903.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/66542433514.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/fofamotadomumox.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eda233276---77099356102.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/wuvosuvogawebi.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_off0000b483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB483 10344 bytes
SHA-256: 6eb9fcc1b02a153b537f20f9a90da1964c1e300fec4b4f4d24fda6f4e60c1b3a
font_01_sfnt_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 15208 bytes
SHA-256: 6c68591ce4b0993e1e013fb2fb1cca55acb57986d2182c8290eb536255a38e0b
font_02_sfnt_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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