Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe231a879d415146…

MALICIOUS

PDF

91.5 KB Created: 2021-08-22 05:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8edc96412c1a52e97eb4e9c31c7576c3 SHA-1: 3453b853f6c00269232e922ff29746df29eb0031 SHA-256: fe231a879d415146705f2a92f05119db9fc564558f5a7f2f94cb40fdf857c8d1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, likely serving as a lure for phishing or malware delivery. The PDF structure and link farm characteristics suggest it's designed to exploit user trust and redirect them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crystal-lamp.ru/uploads/files/kuludob.pdf In PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/wegebasivikifurevotipomu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30e80c48d---babupunepajozatotofasete.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5cca028176edf7fb530e5197d8eb8407/gexexafalibamup.pdfIn PDF document text
    • http://healthywithhart.com/res/file/gotike.pdfIn PDF document text
    • https://digireg.li/upload/87635212606.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/01ef25807da1130acf9540f887815405/dedujurimasevafubit.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/gezuxibup.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/dumuzike.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5e752f4b1---pusotonobekope.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a730fac9299---16508473048.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075d61d369d9---24347365236.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xojive.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/78903326350.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/90531434583.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/83488118792.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/64155297186.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdbc9859dc---vasutipugosi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef2085c06e---nubewizevaxaduvawifuvob.pdfIn PDF document text
    • https://taperagi.com/contents//files/51062491783.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105170102479243.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ip5rm5cvh0bmjik85h6ott6hn9/zinixuri.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd53b63313---70019759461.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/30168712710.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/mesevisife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+godhood+chronicles+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 10748 bytes
SHA-256: 4899695a1fb1043e6a894ff8661f6423d57df0df139b7c79a6d6d914fc1b7451
font_01_sfnt_off00010181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 17796 bytes
SHA-256: eb2c933092bd6977bb72b1184e533c9130e44bc26e86cafd86edb4528b5ff292
font_02_sfnt_off00013071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13071 16416 bytes
SHA-256: 8d4162df07913cbd75aaaf5c1db4b71207ba25b7fe42c8eb5140c3474b8f8896
font_03_sfnt_off000146f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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