Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b626c40f65a26f…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 00:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d330f3eae355b819d1a30031da4c4ee SHA-1: 6646f74ac880da305a1a37e9ae6f5fd991a1cd15 SHA-256: c4b626c40f65a26fe9bd46dc341d4f53099e2679a883950dc64b6977258c8607
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan distribution vehicle. It functions as a link farm, with numerous embedded URLs pointing to files hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=about+satan+in+bible+verse
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850dbcad8f8---80858819769.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/fed823a59ed24f9a47e39eee8f8df136/88293996677.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/mjob3sg2pdaf03r5832sm46qen/50038009848.pdf
    • https://majorsagilekvaros.hu/uploads/file/tuxep.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad09674c6bb---56552786852.pdf
    • http://prmakeup.com/Image/files/kibaguzerevomivebivugevej.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac192cee9b9---dinijab.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cr133sbue848hm9q7senqfrfn4/41850711250.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af3bc3f7b---javagerosogeberatomedu.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/30n5mac5h2r9cedtt45vhjoq8t/99074006220.pdf
    • https://papiratisk.cz/soubory/josemurezeminetepegilaf.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983ffc8bcc2---dazarusewarelinu.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/7b31469ceadc4b3576089c0faec6c284/mowumewufu.pdf
    • http://mid-europe-ex.com/images/blog//file/73890549618.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/3abc90616a422fae250e0d05ab1063f4/zewedit.pdf
    • https://hsse.cl/files/48993186074.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ae2523635aa---kirofurekir.pdf
    • http://axiomestates.com/userfiles/file/66987054865.pdf
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/47641963935.pdf
    • http://szao-spb.ru/images/news/file/vasuwugan.pdf
    • http://thermogroup.ru/uploads/files/morosumivorakoreg.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef77fb572f---pulokumikelezonaderida.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d3edcca7c92345c4c4af93d2b9fa27de/7026940842.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_off0000ecda.bin
e8e1ec1ea67f199933f85f558ff554aec63156331bd9a219024581d1360e60c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 10388 bytes
font_01_sfnt_off0001048e.bin
416a542e249e2aed64b3ebaf88c0514e0e40d5232f8f7bb557486ac6cc4a6d49
pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 17128 bytes
font_02_sfnt_off000130c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C6 16792 bytes