Malicious PDF — malware analysis report

Static analysis result for SHA-256 5579dd26d178fd61…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 15:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99fede91085af382724c87dcfb626703 SHA-1: 2c1f3b87dae928f626b79bf506dced935ded2d07 SHA-256: 5579dd26d178fd610c450280d8b53a5f3832f24be88fe5e275b43341528cc311
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan distribution. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to lure users to malicious content. The presence of external URI heuristics and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=online+music+apk PDF link annotation
    • http://kovospm.cz/fotky/file/xajovadamepokuwaxogovikum.pdfIn PDF document text
    • http://househouse.it/userfiles/files/wukegupexajananegime.pdfIn PDF document text
    • http://egitara.com/upfiles/files/15512312833.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/59665339829.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/rememunepovuradaxafenotu.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/sipabovowixodakegetujita.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/zovivesegujekavexumog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303d6450749---71702504320.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xotodufaxi.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/dazenemesewag.pdfIn PDF document text
    • http://etnorom.hu/pictures/kupusojiturobinesanig.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/vuzufekuju.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/pulusawodirogek.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/lipeja.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ef021429838c219a184f1d1975c20a6f/nabuzasaxujowulotitulilu.pdfIn PDF document text
    • http://alkanboya.com/files/file///27315268222.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/likoxufedazided.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16145f54bb052a---20983968139.pdfIn PDF document text
    • http://shophouse.info/images/files/25490970956.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/81809927364.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/rodewewes.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/sabibujevivodudo.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/wavuvigefuvijesidavopejor.pdfIn PDF document text
    • 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_off0000b124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB124 10436 bytes
SHA-256: af99be598485ee7a6c173f31195eeee47da69a8276647a7eceeca33a8d3fda23
font_01_sfnt_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 15048 bytes
SHA-256: b0b7fb4fab24a13b83392a9e855864fda88f19c7f0b59f896a0e2e2b8bcd7994