Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e08d4bb52ca32f…

MALICIOUS

PDF

84.8 KB Created: 2021-07-07 07:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 382934dad4c0d9b08e38f46a6d37ca7b SHA-1: 4b76cc6a62f3deedfe113c72bacc6664fb6ecf5c SHA-256: 55e08d4bb52ca32f3fe2fbfed204685749d5a1abc488463a26d705e37df247fd
196 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a direct analysis of its content, but the heuristics strongly indicate a scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/bo5pmjet401od4igmodvtlu22m/litiw.pdf
    • http://aimic.com/userfiles/file/maweg.pdf
    • https://chrmglobal.com/userfiles/file/vawutofo.pdf
    • https://tkquiz.com/userfiles/file/49962654305.pdf
    • http://soft-pro.hr/upload/datoteke/40940408543.pdf
    • http://benthanhsgfarm.net/images/uploads/files/mifopezaravafaf.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3f6512e5---21231703439.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/80545925984.pdf
    • http://araonline.hu/uploads/file/34823461958.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e921aaba5d---61850809326.pdf
    • http://cesmclassof68cheyennewy.com/clients/82478/File/duvoxedexifon.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/55e5e7d81e28e6c182cb70783c07cff5/9671252620.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070b02705355---77004373768.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/9a3fp6bi6srgbv90hsdgo1akd2/remuzojoxogi.pdf
    • http://lab4050.com/upload/editor/file/sofifinowefaduzokovazidab.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1d81d4a08---tebet.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6cae5ffd3---72240519356.pdf
    • http://mini-garden.ru/userfiles/file/tajujem.pdf
    • https://tavio.ru/files/file/berivigipupotirekatuzonu.pdf
    • https://cakesandcupcakes.net/userfiles/files/tovoginevulanawavebi.pdf
    • http://ptaki.info/imgekoprojekty/files/95409670442.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160867592c9321---wikeboxasofesijivejadu.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c5601299cf5048a8e48982a46a389430/tevujupanoludo.pdf
    • http://kleiberit.ru/files/file/1313224048.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/zububipoxifilaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+properties+of+a+wave
    • 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_off0000ea80.bin
8453cda987a2298157efa898364d591f6b1355819da18adad794c6f8ccc617e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 16784 bytes
font_01_sfnt_off00011606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 16792 bytes
font_02_sfnt_off00012e1d.bin
a76cca74e6efd94b3e767a9ab4f92d48b1973bc66bb44831e13fffb7bc44fd40
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1D 10420 bytes