Malicious PDF — malware analysis report

Static analysis result for SHA-256 033888323c21c456…

MALICIOUS

PDF

88.8 KB Created: 2021-08-19 11:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57a8eb7c47c1267c8a3a8052af4ede3c SHA-1: 49ca9a68a18644a3d18db3031e0a816197668885 SHA-256: 033888323c21c45603e7be32dec0c933690126849adb522feba8aa80936dc64b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=can+i+put+a+topper+on+my+tempurpedic+mattress PDF link annotation
    • http://hanifeugur.com/image/files/naporusevuwajizek.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1932d68792406bb03bf2cd6e1f168a54/45061550657.pdfIn PDF document text
    • http://inistor.com/ufiles/files/48262393135.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8e898ac51---vetewaxamawapewu.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/87927863503.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///96875917420.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/nokuk.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/jenerawinezuvobikakawejav.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/42441440096.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a214d69237e---81392745576.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/90316017241.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/52476988434.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160779d62ebf47---mitefapawuwitixonozipaw.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/wabafura.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/43278459535.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/91725735819.pdfIn PDF document text
    • http://enricobarraco.com/files/22948308797.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/timinenubenimuwotokizeved.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8af98b4de565a069f1478ac89fe8cdfe/dinozofukamenebusedadul.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fls93p65deqcbqtgjv80i6efqt/kijoritaloxopijuzo.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/dipitofemexupuratagurelar.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd4ebdd6d7---radirupatobupujowurezewa.pdfIn PDF document text
    • http://www.asslar.de/downloads/32995154478.pdfIn PDF document text
    • https://steammining.com/userfiles/file/54787215991.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_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 17316 bytes
SHA-256: a5bf85eaf32e4882ccb49d527321808fda5189cdfa0a6f3d2a00392d2b433a8d
font_01_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 10872 bytes
SHA-256: 5ca592ee95ce836f484cdfa818483a47ecc6c43ed01bccd0f339bb15aa3f17cd
font_02_sfnt_off00013cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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