Malicious PDF — malware analysis report

Static analysis result for SHA-256 1438616b313fef9b…

MALICIOUS

PDF

90.3 KB Created: 2021-06-28 22:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 220110a69160e524675721b94b6c52c9 SHA-1: 8b52382678e9d928004e9a27aedd359ba6f4209b SHA-256: 1438616b313fef9b81b12a24ea84c03e19367da9b38a79db0f997b9dd61cf473
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall detection as a Trojan indicate an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://brawlcall.com/ckfinder/userfiles/files/41558413231.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/nafif.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ccc3443bf608409696f4f3023122c5fe/sitizewuvirokutujovi.pdf
    • https://lescourailleurs.com/upload/editor/file/87896729574.pdf
    • https://syteq-pro.com/userfiles/file/tibonunoto.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a616826db69---16715314349.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac8c95dd3eab4bdbeea6f133797926c5/tegabatilukugawupoje.pdf
    • http://mim2010.ru/userfiles/file/13854765711.pdf
    • https://kisikana.hr/userfiles/file/valuwot.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/16761b91770a134a7764341cb1a4bc19/38950387922.pdf
    • https://ytdrive.com/CKEdit/upload/files/buposepuzonoxuba.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84747ee68---ximapusaxizitizibegos.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b1d77bb5c---surapelamaxit.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160872797b287a---96570605026.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bf81f7ab55d---53702230189.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f6369c406---64606853546.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/48795688259.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+much+minced+garlic+is+in+a+clove
    • 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_off000100e4.bin
e8ee6d948d687051a4675b1fdd65158662203834dd459e068bdde16802283a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 10960 bytes
font_01_sfnt_off000119e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 16792 bytes
font_02_sfnt_off000131f2.bin
b1413eeb8ddc2347928898a46c7f7d07ad1c8d4e06c258996ffc7f76a757e56f
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 16384 bytes