Malicious PDF — malware analysis report

Static analysis result for SHA-256 a435b863a048329a…

MALICIOUS

PDF

93.2 KB Created: 2021-08-03 10:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15260dab08555529e25e9ce4547b776f SHA-1: 712d5955cd02b8752d9ef3453a111868c673c40b SHA-256: a435b863a048329a9e6d709ea6521f537d7ae8a8ed6a465dbe84bdc8009a2f79
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads, indicating it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e4661b7ce---6434338110.pdf
    • https://southwestlooms.com/admin/userfiles/files/zuzawojaxasuv.pdf
    • http://essentielles-theater.de/UserFiles/File/67186334854.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68ddb8dbd---senezokoxirevoz.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/3ec05ef3074f704a7fa33c8d141afdbb/98518162678.pdf
    • http://kaies.cn/upfiles/file/73361326163.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/21e2acffe9e532b579c12072c71ac4d4/45069398178.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609630026a6a8---bavifawinalu.pdf
    • https://die-elke.de/cms/elke_page_files/file/lavufowu.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0b26c8d8---vaduwarikepob.pdf
    • http://brooklynsmokeshops.com/admin/images/file/46350713245.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/i2ncrahrp8tu8uoufg4cj2dtt4/rupaxifogoputalojadesuwis.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/93814289841.pdf
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19499114966.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ch3q042vgv79vrcskq0cjttun3/29687863029.pdf
    • https://tarzminder.com/resimler/files/71706988387.pdf
    • http://grawerlik.pl/userfiles/file/muzejonekefuboluzek.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/22384315470.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e83206723e3b7d9ac2a77763315e8af3/wonofewarik.pdf
    • http://midospa.com/upload/files/kegezezetoziwetinoxivezuf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=calendario+septiembre+2020+pdf+para+imprimir
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 16792 bytes
font_01_sfnt_off0001074c.bin
d4b0027590784c00f28f9980510275f2691bdac7b5dec62c9d39876fcfb9d20f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 11072 bytes
font_02_sfnt_off000120dd.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 16312 bytes
font_03_sfnt_off000136e4.bin
d2db294aa6991148742a8ee7940d21b675762ed6b319d7f1bff1da1f0b276c33
pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 17628 bytes