Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d31dece96964a30…

MALICIOUS

PDF

80.8 KB Created: 2021-06-30 13:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3c01b2e7f3c25386b05911ee567c6a53 SHA-1: a9b1ee65c68e9076680cdbaa67734d7301f14755 SHA-256: 4d31dece96964a3039c3b90c47bb7e3068544f4df4597897a82d8258aa7deed5
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://outspokenholland.com/userfiles/fckFile/20210603130211.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e09bc3468---rudijexon.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/ripuloz.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/31772858043.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/384f0a36e8579a638c820c763cf74571/30749258445.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ea210fa41---31364488061.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/bedupijama.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e3fe1aa17---80924269838.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/dolewatozutameruj.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a2eabb269b4fbc54f4268e5efbf07a2e/timuwix.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed56adcec---segesukemazekirapaz.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/kb1ee2ftc9cr6gf4umn6ce4kr4/42549684641.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/45942444289.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ml3bnte85j8l3clkbr31rnici7/94218510736.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/69869486258.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2bce16c31---kepatefiberi.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/30882986867.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a04989a45d8fa1f67d94cd45d09da05e/628736844.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/29ik00nfcsbltppmnh6enoiisr/52785711773.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c8518390ad10f8c43080ad12587ed182/22626563996.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bda3213192---kerizurukuzox.pdfIn PDF document text
    • http://www.bandungmesin.com/file/batupikewemelilufifuroban.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/nokusevudofepamazunuzaje.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a1c60af04514fee9e9e70ba7c7e30274/lilokalujamipibimenuxi.pdfIn PDF document text
    • https://steammining.com/userfiles/file/24972336394.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe540cb4ab---defanitipoxofadatekit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=recycling+code+of+petPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 10524 bytes
SHA-256: cac96c43c7b4dc55902f81dc8791cd056713e9e4ceb4e10b2382d35aaab3c486
font_01_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 17076 bytes
SHA-256: e7a8e8384445ba97da3deeb1120de088191813a3b6fc8b23b2f065dcf5d2f169