Malicious PDF — malware analysis report

Static analysis result for SHA-256 4060687459901e52…

MALICIOUS

PDF

91.3 KB Created: 2021-07-30 21:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d1ba9d9c013ca721c993e54f0c38c21 SHA-1: 9ad59fb35bbc1b0a70f958e699d71eec4469562c SHA-256: 4060687459901e52f2b80fa16a49874c38c3374c4da75577bb1f971c8913a707
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=best+drifting+game+pc+reddit
    • http://keacg.com/upload/files/tozedurifemenifaxijopi.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e6852ed46---funubapapalesirixo.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4fd789302a99591ec8d68415aa78dd3d/sumexirolalomubatub.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/bef2acc856646c5a36d67ec29f6ed1f9/zerabuvituzebakavumivoxi.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073b39f19b63---40811594128.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087f311b6f9f---48152817358.pdf
    • http://chothuexeninhbinh.net/data/dulieu/files/24001463735.pdf
    • http://wienbildarchiv.com/upload_files/files/dudapilixinokatitazowo.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81e76f557---marum.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/22326f922b103216a17cc48f72d058ed/18269977578.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3be25431a---begozowogal.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c05d278ca---9855162514.pdf
    • http://turnyras.lt/Files/file/90833295912.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e50e2da65b---20576178269.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857e27333e8---kidozadubezozepobepirix.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/548669be4e578074417074c8a1424ce8/85632047959.pdf
    • http://dansensvenner.dk/imagesfile///butevuwexiramagopejokivik.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/sfvf49eteg7v5jq9g73njbr0pe/witazukow.pdf
    • http://hyundaidongdo3s.com/images/files/11908527526.pdf
    • https://fablab808.com/nbloom/fckuploads/file/wibex.pdf
    • https://hostingyuvasi.com/calisma2/files/uploads/25989858031.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/abfeecbcc8b0552cbe6d2c38a5ebafa1/61727040807.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/wejusupulemapenufi.pdf
    • http://hoangminhphatkorea.com/webroot/img/files/nurupisu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010095.bin
a6397504b513ba608dcd1a54674e384a83e27625f8d1ae09a49348149f19dcfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 17256 bytes
font_01_sfnt_off00012d90.bin
2f5a3e722b2bccb3800b4b8668365a7325e3ef7abbe94ccbc67e42842d0dd12f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D90 10852 bytes
font_02_sfnt_off0001466b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1466B 16792 bytes