Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ede84bb4f8a3e2…

MALICIOUS

PDF

72.8 KB Created: 2021-08-04 23:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fe598c5cf0e1d0f111930bd248b92c5 SHA-1: ce3c5880d71222910a87556749bb3a20d8a23da8 SHA-256: 58ede84bb4f8a3e267a3db3a9646835aba8b11101a714efdd30e4693380a8fb8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ikkosushi.com/uploads/files/9228088735.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e29a3868d---liditonoxatas.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a745ce8a370---12129104907.pdf
    • http://allamericannursing.com/userfiles/file/75286709531.pdf
    • http://dakmet.pl/upload/gixefegakaf.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607731d44cc5a---24687227717.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160750d774bb1a---7241596507.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb0a621d92---79747782874.pdf
    • https://dondepodemosir.com/userfiles/file/44887497179.pdf
    • http://vhktn.at/images/content/files/bunazaji.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cecb90234---87841690769.pdf
    • http://slippersymposium.com/clients/875641/File/7062891048.pdf
    • http://beautifulmoda.com/userfiles/files/kuliziwu.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607562518dbbe---kezoworew.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7dda779c2---13534261418.pdf
    • https://majubesar.info/contents//files/wikobefifezemelagis.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/butetatujup.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fb35cf37aa0---96262018624.pdf
    • http://sbkf.org/files/files/57039016833.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16102e4d668a01---61214292264.pdf
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/43915320376.pdf
    • https://batikatravels.com/userfiles/file/lizukejazeme.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+take+apart+a+whirlpool+duet+dryer
    • 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_off0000be3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3C 16792 bytes
font_01_sfnt_off0000d64e.bin
9c9d29fda492d9ea9c2e710ee0d5e17fbf9688e16475aa34f74365de35c07013
pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 15432 bytes
font_02_sfnt_off0000fd8f.bin
c4f67d7c3b1dcd2bd9fc41fe335ba51e4844020171f403a97dd41415347b56f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 10600 bytes