Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e844b3b34addac8…

MALICIOUS

PDF

82.0 KB Created: 2021-06-25 14:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d588ffe5c7b5d11349ed84871ac3bab SHA-1: 13983d5b5ebbd1cad3ebc9788a0e00fa2ecc1358 SHA-256: 3e844b3b34addac84a1d1ce632b7ce8ea77ffecc1fc8a9e46c98989a71249539
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate high maliciousness. It contains a link farm with multiple URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dlkpddpb2gshvvkplj4h2lq9c9/179562925.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/75ff07575bb4165448105bb3e4b0041c/basinarelufufodiditevomad.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/08eacabd093bfcbf15061882677349dd/81327337622.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/61457dd42a3f4e2ada826a28d8f8ed7f/18691467554.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/06c8eed2699b5e16451f78eb9868edf3/83517770232.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3ecc2a68c438acd7fd432344b09aba18/21956300678.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9ffvdi2cvps5hckpjjkum770i6/66801023035.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ii40ifhit3ukrb4u4e86li6d06/25791041345.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/49315084137.pdf
    • http://kapelski.pl/userfiles/file/66650014285.pdf
    • http://svaz-podnikani.cz/files/file/dibavewomese.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/7e52b8daa47a8f3a621f02433767b949/wetoganagokaburavafovira.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd7371073---16309923929.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073d71c18dc3---98460314101.pdf
    • https://tl-systems.hu/files/files/75124882196.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607936514c01e---68913766184.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=quote+a+website+apa
    • 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_off0000df40.bin
1d7d0a1f68e625631f268cee3d62f1f8e9bdb04b9b34109c8828b29251699d1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 17052 bytes
font_01_sfnt_off00010bc0.bin
ee93b60049bf0299bdcdb59d7254ecd5273fe244162274d359d04f4d6c1b23ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 10380 bytes
font_02_sfnt_off00012357.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 16792 bytes