Malicious PDF — malware analysis report

Static analysis result for SHA-256 5048b795054a4714…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 20:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 794d78064d54f9a2828708e0e8490e7e SHA-1: 75c1ee6ab2dba505497dad24ea6cb3fbd550a065 SHA-256: 5048b795054a4714db36b0290321e21ce4aeda0dc33b2a15e2f4a038b60f0efd
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The primary purpose appears to be to host a collection of links that likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://thamdinhgiadaiquang.com/img/files/kuzakagagewesuselepalosu.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ca93198f24ce98a3755e16b973f40b60/51739537769.pdf
    • http://rogo-rotterdam.nl/files/30577762798.pdf
    • http://nfc.soo.jp/file/44014320961.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16129ea248ffa8---bagured.pdf
    • http://uniquehotelsolutions.com/files/others/gumawipabamibalisukino.pdf
    • https://bbpartner.cz/userfiles/file/14303424114.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/68994748113.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/11590839977.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ec1e42679---96986755164.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/fa7c4b740c717ad4151020ebe489b2b2/73693637037.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/eeabc5fa18d19e60d21043128f714886/13916449070.pdf
    • http://babamoleskine.com/files/file/suriz.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/rurev.pdf
    • http://vom-ragnaroek.de/uploads/file/lukazafetupij.pdf
    • http://globalone-mould.com/gbw/fckfiles/20210829063004.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7a5002ff2b611ae64a591ef8329266ac/94088274523.pdf
    • https://98ing.com/upload/ck/files/20210717_094316.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ca433420---pefopagosezipavekukato.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/64mrnsuc8q7fh18mhg2n4je7gm/14394272679.pdf
    • http://48bulls.com/js/upload/files/14523276639.pdf
    • http://apnorajasthan.net/userfiles/file/80101068024.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=chevy+3+speed+manual+transmission
    • 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_off0000c150.bin
3cbc285202454edcb93d11c096df2c66c7697834679ffc7715dffed7b007aa14
pdf-font-stream PDF embedded font (sfnt) at offset 0xC150 16188 bytes
font_01_sfnt_off0000eade.bin
98e9b46518ea62fe81a2c5ff2f285ba7f95f80511a7a873200824bc047bc53a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 11140 bytes
font_02_sfnt_off000104c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 16792 bytes