Malicious PDF — malware analysis report

Static analysis result for SHA-256 335d693861060504…

MALICIOUS

PDF

70.7 KB Created: 2021-09-16 20:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6a8f30744e31ef63318619ddc7de3dd SHA-1: 22a7529c48c5a7fedbc03e8895d82a413d898f5a SHA-256: 335d693861060504246e9c9e61b885dad69e87ba17340b5c21a4b6b8bec0cb3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and points to compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://garglob.ru/uplcv?utm_term=kickin+it+episode+1 PDF link annotation
    • http://floral-design-lindgens.de/userfiles/file/gedetupudigoz.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/lukafegogofofagibel.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1841cab25---86208018421.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/36002967173.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/saluvopinafefamud.pdfIn PDF document text
    • http://masonhn.com/d/files/42947131072.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/sasuberakosa.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/31165109736.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/dabezesogusikosevul.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/23137366751.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b37143b542ff3cb6d74bcc92bc09bdf1/sufap.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/vorolamagunuferarejopuz.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/2474969980.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/79247326030.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/tarunovarafemorujupuwu.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/72656900857.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdc0f1f3f---mujufuvigokokedati.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/nagegunikujupaze.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/fexesokur.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/99669172559.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ldfsqhddfvc4eo7ck2enc8gjog/3079282549.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_off0000b4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A2 10336 bytes
SHA-256: 40307cd80d55649edb113f28fd4e7265b0b24a7ed4d8d429948c44ad16988cf5
font_01_sfnt_off0000cc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1A 16152 bytes
SHA-256: e044a8478783149558a63fae45ca95971c62bcbdb6bd84243a4f96e11e6f0fde
font_02_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1