Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9c3222a4d4ff6a…

MALICIOUS

PDF

81.8 KB Created: 2021-07-02 22:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f2ce2185632f0a5ff9e73d46d989f82 SHA-1: 13b2c42e55cf6ce989e305d0ee619eeeeeb4366e SHA-256: 3a9c3222a4d4ff6a4c326d9a1d8155db3a776c8e31faee827a963cc227c5a17e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://lltsg.com/uploadfile/file///2021062420175432.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b4f6c364f39e400f04ddba70c4efda58/juvorolu.pdf
    • http://ipsgroupjjn.org/userfiles/file/26126188207.pdf
    • http://border-inn.com/CKEdit/upload/files/rimulizineridezuxamekugut.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/78519557432.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/83a08f608903425cc9d4dec2311ab0d8/85682072975.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c793c57a0a---79657895755.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097717e1e398---36117806542.pdf
    • https://imagebeaute.fr/userfiles/file/letixag.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606dce050ecb6---dobudowuwirebalotedi.pdf
    • http://castrolmintabolt.hu/images/upload/file/98244459731.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a7d97cf3---likebuxanuranabifo.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5243a171ae---benusurepibipug.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/70d9616168ce1700bfa012ade5fc5238/zegewugifugajo.pdf
    • http://nappsa.org/userfiles/file/wulepan.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa20e827b9---2587564234.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c253ed2ad73---rivejimetabodusav.pdf
    • http://contactconfiance.com/files/files/94019065270.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4811809ad5414546f8532c9e5dbe5ce9/tanijevobakij.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6fa405c30dce381ea1a4796b3f36de5b/2151019042.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095948084ad6---52968151294.pdf
    • https://prtl.pl/userfiles/file/fewetumadisagomosud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+meaning+of+durable
    • 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_off0000d5b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 16792 bytes
font_01_sfnt_off0000edcc.bin
33f9759471520ccdace112e2240d4c5ec5282afc144c5bd5b8b66d24282a299e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 10736 bytes
font_02_sfnt_off000105e8.bin
2ee5189226b89606d50b2959a7d4d8d577f34af7bd059a30fef63f3c052c4c98
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 19352 bytes