Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69fc1f19deb9d6a…

MALICIOUS

PDF

84.5 KB Created: 2021-06-25 23:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fe79074b94e50ac59da3096453eaf19 SHA-1: 6bc5ff5afa96a55724fe526e8111c5fd9e322cb0 SHA-256: c69fc1f19deb9d6aa40cd7641eaab52ec99aad0095718fe1d77eb7a0f2d9b166
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content through a network of disposable and compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://a-kamen.com/userfiles/file/21038966713.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca306f9c328---zutebobepu.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160745e3b235e5---sanufogiwodozerare.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/betusazog.pdf
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/similadedet.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9277b96acf889913a0e2ba0a54857d51/488427875.pdf
    • http://www.allatpatikapecs.hu/images/file/97014257120.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0e0d8e256ca7f54de644b14867695709/66611887804.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071943833603---83165399036.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c08cd9cd---36976521921.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609131ab2bc9c---jewutezirovovagivibet.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/papadamoxivanidujuw.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/22b590eba0ece2ef6d2edefacaa2e917/neroxojeguwa.pdf
    • http://emurus.jp/userfiles/file/wafobubedi.pdf
    • http://a-kamen.com/userfiles/file/tonovib.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb7fc47d17---gakanujevodokuvi.pdf
    • http://csc0311.com/userfiles/file/20210610132440_g3jfxg.pdf
    • http://jikaramen.com/uploads/files/26582078719.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210528_F17907F3387AE55B.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079209e43c6d---rater.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc3678e86---nemurifurolanevitoz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+print+a+photo+on+ipad
    • 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_off0000e7a0.bin
757bac3f0dea750f0fb3878c35a0860cbb03eb8b14f1085754537632c72f01af
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 17800 bytes
font_01_sfnt_off00011603.bin
caa2602946bc64d99dc8a707a7deb5bd711ae806dca46ce7487c5addfb6b7619
pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 10220 bytes
font_02_sfnt_off00012cd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD2 16792 bytes