Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caf0b890d04e3b5…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 18:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72d802635c80a2a7f53fda97c95c298c SHA-1: 1071da6a8f4e48b80381846ef8da4e516b6133c2 SHA-256: 1caf0b890d04e3b5139359f0834ff4ef31d9b4d2bf891d02acd23b2fe2c13dca
176 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous links, some on disposable hosting and others pointing to compromised WordPress uploads, suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nhakhoauytinhaiphong.com/upload/files/3221944142.pdf
    • https://fobh.net/userfiles/files/ruduzojusenamikekofuwime.pdf
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/wububosorekibin.pdf
    • http://www.travelwithtaangoo.com/img/file/53403016641.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/nuwiruga.pdf
    • http://wellnesszeewolde.nl/site/data/ws/files/56615985873.pdf
    • http://shinex-auto.com/userfiles/file/12185822006.pdf
    • https://giltmorestukko.hu/ckfinder/userfiles/files/sotugivupagud.pdf
    • https://gulf-rope.com/images/bulk_images/files/dikananisasifedawofekar.pdf
    • http://traslochimontalto.it/userfiles/files/59589294800.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/afd2d4808fd415f87df35cb648e85f4c/mudujosajemozataxa.pdf
    • http://vwtint.com/userData/board/file/52260322513.pdf
    • http://taxfreepoint.com/file/fesimufipozelemugar.pdf
    • https://biographiewerkstatt-singer.de/userfiles/file/64398358120.pdf
    • http://fruitvita.com/files/files/54648956086.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/445b07e956212631fb4c4802eeab5f53/lufuverame.pdf
    • http://zoo-foto.cz/userfiles/file/piwinukalamonanimi.pdf
    • https://webaprint.be/img/file/lazaxomodulagekaradore.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394229a240d---67714712106.pdf
    • https://ssmavidiyar.com/public/content-images/files/37314248191.pdf
    • https://cengilli.com/icerik_images/file/45017135084.pdf
    • https://odlingfamily.com/userfiles/file/besabokajapizadaligobu.pdf
    • http://studiogaleazzo.eu/userfiles/files/fegutu.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130205cadbc9---tusemakitoverev.pdf
    • https://icon-studios.com/userfiles/file/burovosulajawovibexakefo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+1+beyblade+burst+app
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elem
    • 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_off0000b817.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB817 16792 bytes
font_01_sfnt_off0000d02e.bin
1156db84aa3b5d2ab6f78909562a507655d3f3219112337d356f73cf21593b73
pdf-font-stream PDF embedded font (sfnt) at offset 0xD02E 10772 bytes
font_02_sfnt_off0000e8f3.bin
06e0588c259dd4d612ce517d37dca5b66bc2423f357e3738b94d3e659574334f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 20096 bytes