Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eda02e4e26c724b…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 00:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0c002f1a23812a0a15dc44f89a35c29 SHA-1: 3ea5dd5070e6ac2d7763adf6c17d6c61a148c3c9 SHA-256: 4eda02e4e26c724bb295cc2b8b6c284efb0e20e8bd7ab98bab2e9ffe988b1b3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, directing users to numerous external PDF files hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://i-daa-wl.de/userfiles/zekabedazelariwut.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/dpp2ihbu0meotkjvta28t6rlmn/9004309811.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b80c027aadc692639a74533aee66d0ea/dusuvopofexes.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916bd2185e1---dewijufowamitide.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/48796636116.pdf
    • http://whatdwellswithin.com/file/25497414666.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7f6888d5---71076647808.pdf
    • https://t2sc.me/userfiles/81534410731.pdf
    • http://diysmart.net/userfiles/file/81012065659.pdf
    • http://bioident.pl/photos_fck/file/zojowo.pdf
    • https://petala.gr/userfiles/file/lapewirased.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cac97cbcc---11627065572.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3c165423---fifabafilomewekixudeka.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/18981678295.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/32286733583.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/20780883d5bdc5d8dd42b27c2146d819/xonozus.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ofct5um62cuig88ba21fekid0/69944211722.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beafa76ef1e---witexulofexazi.pdf
    • https://heritagecambodiatravel.com/userfiles/file/fabupeg.pdf
    • http://mygiftltd.com/userfiles/file/9486916908.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb45913bf9---16461144594.pdf
    • http://anhbanglaw.com/userfiles/file/16401183060.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160965559c6915---83906635553.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad93d152aea---11457721915.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=total+english+class+9+practice+paper+14+answers
    • 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_off0000e6ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 16792 bytes
font_01_sfnt_off0000febe.bin
7369e2e1771d4c964e44f41e60609f1b1fa5a5c0282ec997bb8b2539471a137c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 16788 bytes
font_02_sfnt_off00012a56.bin
8817196a5d4fd2d1ed9b230ad51bcf805c1c0dec4649fdd9ba4c99e52484127f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A56 11000 bytes