Malicious PDF — malware analysis report

Static analysis result for SHA-256 589498195b6bb863…

MALICIOUS

PDF

88.6 KB Created: 2021-06-28 21:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d39e52bfb11c7c2c0a76b016179a581 SHA-1: 413e5e5777148ce635e2ecfef4830947ea0e5754 SHA-256: 589498195b6bb863acf7e8a5822ae3d03eba7b122fc7e5700347f9f201a761f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or link farm attack. The presence of these links and the overall structure strongly suggest the file is intended to redirect users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=slow+country+songs+for+weddings
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1c7e99c14---lapisazili.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/9532da85b8f44ddbebd6216e9359b0fe/rojufewajegoxa.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d8b438020---78421207052.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbf6d8366---92720641922.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc185756f---voteboz.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f5444878bf6a43ca92c1b681a66f560e/rosixepefi.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ae751d849d4---vivarototadedapa.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c703c71398---lobomalivawapax.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/usn0sgaic3hutept119h4f9sjv/64330901324.pdf
    • https://antae.be/app/webroot/uploads/file/75623629188.pdf
    • https://aashianarealty.com/file/kovuzada.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2bdde0f2b498d966bea7f4cb75092d2f/firudovijo.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ebbc6e0e3eb034f64eabe09b74bc5f1b/kobajubu.pdf
    • http://farashimirooz.com/files/67710803061.pdf
    • https://aspirans.com/files/file/16543169515.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/luwojironiguxad.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2435f6f5099ac32d470ddc4a8fc2734f/wexawidijuxaganujarul.pdf
    • http://playbabydoll.com/userfiles/file/74396254827.pdf
    • http://luingpyrex.cz/foto/Image/file/titaxawanise.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160806d50d6f6c---31551418627.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4e2433a17074ab2ebcdb21afef8f4ac0/48983332728.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d035f71a5b8---jefituwosilakuluj.pdf
    • http://cnmrobotics.com/files/files/dawaziligiwen.pdf
    • http://zabradli-znerezu.cz/userfiles/file/14458526696.pdf
    • http://pokewaveanaheim.com/uploads/files/12920042876.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_off0000f8af.bin
5a317b4c92ee9594381356e91865c34058d72655e3571218c62cb05ef1fb926c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 10864 bytes
font_01_sfnt_off000111ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 16792 bytes
font_02_sfnt_off000129e0.bin
43cf0daf18bbeaf59bc1fccc14fece130c7ff3b1fb3169fe16c80fd5240d5525
pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 16912 bytes