Malicious PDF — malware analysis report

Static analysis result for SHA-256 554b4fe15f1e9ce9…

MALICIOUS

PDF

80.8 KB Created: 2021-08-29 22:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcf7519413945e56316d94e7d084f45d SHA-1: 4e508007f405ed0603f6a3923148472732f151d5 SHA-256: 554b4fe15f1e9ce9c1133c2bbaa79db929c28dfb41606b3efda25b540d1a43c1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af80ac60a4f---webezatiradewukezesuvite.pdf In PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/99646455787.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/86e5ac1e33bfd47d410a05261c8d54d1/15106623711.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/60971801372.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18016ac838628798eb6d983f566f8518/84938168645.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/suwupuveburexivasixuwi.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/4210525540.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/dek8hlpv02tid1mq123c634hk6/fulotavida.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/13311855759.pdfIn PDF document text
    • http://thongthien.vn/upload/files/godipifilekipinadevo.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/74749784002.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/46905115313.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609401881e488---26283575387.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a75c92cd5b337683f6f090b892df14a7/23768942627.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/41591302591.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/79113215196.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/robetuliku.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/3f13057431443d2757b7edbebe34283b/memunadipalu.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/99122550051.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/3ll7a8f6ti566f58gti6i2n7s7/tetuguwog.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/girav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+tree+on+the+hill+lovecraftPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 10292 bytes
SHA-256: b47aebe55daef96274686e8840f119ad7f2835d74bff0f4a1b832b2fe39b7143
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 17868 bytes
SHA-256: 254908ad9b38f07050b747df038389c5872b3fa9ea2a1ca56a97e83c39d34263