Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ef17228cabe993…

MALICIOUS

PDF

85.9 KB Created: 2021-07-01 22:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 341505b0354518ab5c174501a7fead3b SHA-1: e7e379bc86feea199934e3d298629ab1141cc406 SHA-256: c6ef17228cabe993adb9fedf078235f92640830494b343e7e36becc4013a30e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to other PDFs hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sweetbasketsbyjackie.com/clients/864293/File/48858283712.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/c2u1a0ch0mertd18bpt3thfif1/fidutawil.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/v9v8dtu2m7nh6h27o50u59abnm/jopolusepisemivowinodad.pdf
    • http://hakkabrothers.com/userfiles/file///fekaludulowe.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/85130687422.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e7eb47f7---65105696117.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ec89273b56836669e06a08aff156a75d/47503420396.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/df584c640b5e5fc736cd436e9976ecd1/94775686180.pdf
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210615164511.pdf
    • https://nhakhoaanphuoc.vn/uploads/files/kimudix.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/voqmnkcldpf7es0l12sjrmnva4/23993189633.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3497360428---falizifut.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18c17af366---64401207454.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754d548051b---takojevaxigudizexudevag.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/77f6fcc375106b56ef849a388fb14001/viwaj.pdf
    • http://pressvaluation.net/userfiles/file/gawunotojaxez.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf6a7c7a6b---sunedinapifetipe.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/72bb9d7e90172778aa3452c8007e5fe2/zunife.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160837f5982c0a---kelabekebiniselerusogidiw.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2586be0a56---63188705161.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084870f2897d---54262780242.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/28813d040b38521120a39afa6393f1a4/lotoneridibujenegelu.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/616ff12f668ed257e9f74daf641e6613/gazajelapowegapetewib.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c501907c427---sapidepofadozazi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ref+relay+setting+calculation
    • 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_off0000eb26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 16792 bytes
font_01_sfnt_off0001033d.bin
de2c1ac70231940875494a606385cf38e5248689d10ca4074a959eaa4121fbc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 10768 bytes
font_02_sfnt_off00011c34.bin
2c1a9278b603f7e25106a2013ac7a29ebd52856c84c94b456b61ff4571ca7e1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 17832 bytes