Malicious PDF — malware analysis report

Static analysis result for SHA-256 800fdfc5fd94d1ab…

MALICIOUS

PDF

77.6 KB Created: 2021-06-27 15:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8bb2d5eafc0eadc540ff413a12ec0850 SHA-1: 940bd976a12f342dbf2074c20680fda30ae6f1d7 SHA-256: 800fdfc5fd94d1ab49af6354f974aa968dea2bbc931c605b5510cee9f2984017
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The presence of these links and the PDF structure strongly indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=linear+equality+calculator PDF link annotation
    • http://wuxihemei.com/ckfinder/userfiles/files/20210603_193444.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6d6c01b4c3c9d57a1a00b24fc68c8cfc/68762594234.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/gitozivagakagemawepitefeg.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///sixavazo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160735cc44ec9d---51961889878.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2485dcac81---vovorudizebi.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/fonanalajojatakokoji.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fe07b24ce---25388998714.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/92282032318.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3027aaa91---84932356920.pdfIn PDF document text
    • http://planetamama.ru/files/file/tikosesukad.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a2fe67f694f7a47ac01e2af74f10294e/zanoviruwepaxawed.pdfIn PDF document text
    • https://hoalavender.net/upload/files/98779614474.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609815facb585---ximesagibuvejuxizabek.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/05081386191a5cdc8f62b05a0df5a937/dakisiperebakubebedigizur.pdfIn PDF document text
    • http://sam-global.info/files/file/minibadavepezejizabulew.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2fc6a6b577f890f1d794901751f15647/lafidokopisob.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f7211de9---topunolunavedij.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fbc78b3c7b6c238f78b396ff0b1bc639/85963287813.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ac489498dc5c3c61fa833e099f2ac0be/lomibolabizamiwapif.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1df8b0dc4d17b282952fc21db6877434/zokit.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/45266079612.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061016301326.pdfIn PDF document text
    • https://triosms.com/userfiles/file/12091896746.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_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 16844 bytes
SHA-256: 27d5e1eb60ec7ed477dab5ff30d939b462694877d09a07a3e825f2617e854712
font_01_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 10372 bytes
SHA-256: 9dd3dc90ab0ce46bdd36915c6d65dff0df47978f311967a98e06c60f73dd5816
font_02_sfnt_off0001112c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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