Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a0b97b19f37eea…

MALICIOUS

PDF

71.6 KB Created: 2021-09-10 15:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ac593db1e27e762e715c73c27204277 SHA-1: c87a21d04903ff870485d184cc0b5a865664f420 SHA-256: 83a0b97b19f37eea833cd5bb978c778c95f6da2001baf2c0dc939255f50cdb0f
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

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://mosconi.net/userfiles/file/jolobufuzofob.pdf In PDF document text
    • https://atlanticcompact.org/userfiles/files/86869593702.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/85201327508.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/43946456127.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b1e8ec9482fc249a6957e3c2b346e6a1/82750656191.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/nelixazopalabefizepiwexak.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/72208542174.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161310926c803e---44681922440.pdfIn PDF document text
    • http://normel.org/files/upload/file/winezupivakuwes.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kowugewinusazoz.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://babyshelter.net/assets/upload/files/41285748900.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161365748ac9a5---72278508056.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109012221307166.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/fejirozanu.pdfIn PDF document text
    • http://birdwatching.sk/media/file/11819420111.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/rujivumopofusawesoleniv.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/nepipakuwatubet.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/95323833043.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/xuwiziwapizixuwivufiw.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/sodalosona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=music+player+mytechnosoundPDF 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_off0000b66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 15908 bytes
SHA-256: 11a1b96211582f496c390cda2149893fc3fe6d694ab8f65664caed00c5134bd6
font_02_sfnt_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 10984 bytes
SHA-256: dc9ebe020e40ea9e8c73fe44a7157f7fb9de690d16f6a9133ee524c25e52da0b