Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eed52964f55e0f…

MALICIOUS

PDF

147.3 KB Created: 2021-07-17 13:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 075ba8953ba80d1450d9b920ac1a8686 SHA-1: cf2a17d5ea758653439a762603b1d7bb7cce3b37 SHA-256: f5eed52964f55e0f4e502b793334d4cf88d16ec200e2cfd834fc5ad7c71470fa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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 https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/amolq3l66jqml2eigvfmqn4tf3/4369931091.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c233632fb9f---81498734507.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8b7b4a11c---69025514139.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/77997987876.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607a524a8bf57---88740869786.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/30744795575.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071c508462f4---23496858238.pdfIn PDF document text
    • http://rts-3.ru/upload/files/45771287655.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/bgmqcl0uvvusjs66i5r9gmqbfl/nujowuxowanomejexiz.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/83471401090.pdfIn PDF document text
    • https://soechi.net/userfiles/file/nawoledikanisediwaweketev.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079c391883f4---92697134342.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/81a7e93583b35d750c9f47374fc559fb/9658230436.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/danusiwadugilaxuvenalarib.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075c1eb20667---jejogamatajilidenexexawa.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879714b1744---sawixutirafivujep.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a693792d27b1fc203fdcbbc8ab7875e2/dovopudugomogoluvof.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210716204357.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/zimiforajuvabufenetu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jj493f5lkvq8d6e0jgf5rsfqj6/rokipor.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cdabcdd34647d7cff968c5ffae8bea53/zijuvuranijefaxupujewuwow.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/59480873440.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e65f0dc8075---39275248886.pdfIn PDF document text
    • http://www.bandungmesin.com/file/duzewamukirasanipotovuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=table+of+poisson+probabilitiesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ba73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA73 16224 bytes
SHA-256: 919f1bc367624d721b2fb31ab12125a2b73dd255637d65187c7543b9c3013291
font_01_sfnt_off0001d04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D04B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E85D 23852 bytes
SHA-256: 38a1e74355e5a3968697cb6893fd40b296dac0eaa005902224b4299a5cbb5388
font_03_sfnt_off000227d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227D2 10452 bytes
SHA-256: 31e05b31fe4db9147438568f5d86e8864c96a18c2d312358784e31285d9e4c4d