Malicious PDF — malware analysis report

Static analysis result for SHA-256 caaacbb84735a82c…

MALICIOUS

PDF

122.1 KB Created: 2021-07-03 20:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 781ef5e97bdb7c02d59a4807a1d73e06 SHA-1: f67bd837247807af6d39167e6bdf467a5a7fd026 SHA-256: caaacbb84735a82cecec9ea763431c8fdfbe08f53f2079634f82c748f93a98d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, identified by heuristics as a 'link farm' and 'compromised CMS upload'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/veaq1j6ob323euof0v8sjegi84/50334732379.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f12796436---45676324651.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc67835d398---dakofunaxetepu.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d018e1223aeca8555fa79d8106fa49d4/kesexosapol.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ptajnuhjt9rsf4vrcj7djskjui/juxopeselipunoparebilibip.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73838bd82c---jikapi.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607845d90fe2e---76699490562.pdf
    • http://ahcxdq.com/uploads/file/272216007999.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d400c66255---47468330197.pdf
    • http://relaxzenter.com/uploads/files/50579661992.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb49a709451---gebepijegepetasezowa.pdf
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85967686726.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739aef6661b---91495184271.pdf
    • http://trendymamy.pl/userfiles/file/75547958560.pdf
    • https://webmenuplus.com/images/file/33176854174.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b335b5745a2---96623993426.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c5fd1c373c24701635fb31e8b4d49759/33161167449.pdf
    • https://ludbaegitim.com/calisma2/files/uploads/12352709112.pdf
    • https://marmarases.com/upload/ckfinder/files/tomijakoguzenikefu.pdf
    • http://spreewaldatelier.de/img/editor/file/83235035411.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215142018304715.pdf
    • http://medrea.ru/upload/files/99981300299.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a7f4ba3e1---zinukib.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dbcd5b316---17843379707.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ceee3d4611baa79e05e6213a0c11f60c/87748206151.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kids+movies+that+start+with+y
    • 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_off00017c40.bin
0f77e8096d180ef204852f2cd553b1c7d4b357bf1583e3ba3fecc8e7c1374f05
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C40 10620 bytes
font_01_sfnt_off0001949e.bin
0d90dc3040230fdf4686de11142acc8f4f9393e7a003f1f3d1ad39aa3b3586c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1949E 17996 bytes
font_02_sfnt_off0001c312.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C312 16792 bytes