Malicious PDF — malware analysis report

Static analysis result for SHA-256 044c3a6ccf2d2257…

MALICIOUS

PDF

74.9 KB Created: 2021-07-05 22:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4985c3516cb5344a16d1901b0fcc3b9e SHA-1: 27588b0729eb3cdd580d3ddc263344dea7026956 SHA-256: 044c3a6ccf2d22574f09337660bd216bfd5f3148eb4d1c5e1ac88a61ccce8000
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://a2designbg.com/userfiles/file/48022581951.pdf
    • https://dbjadow.pl/attachments/file/31398535763.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c4754268---89332051105.pdf
    • http://24cvety.ru/upload/files/zumifasovesufabuzu.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/85634dcd2a858900ac1aab163d4ea9f6/67146390647.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8771f255a---97305514265.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/edad45f1b69c8def8b24f5900e11af65/28116036798.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/81351292887.pdf
    • http://secohthailand.com/file_media/file_image/file/dewofatudepuvu.pdf
    • http://4bx.pl/public/file/18444046877.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c3e08348d34e9cb95aeafb5ee189b32e/43155537864.pdf
    • http://broadgatecapital.com/userfiles/file/zerupezemovobin.pdf
    • http://mishelik.ru/userfiles/file/jonuzevubi.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/lozejelavog.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/gexuwiki.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/74openqn8bot5673d7uae0f8p7/54814524361.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095843acffb4---debiwuxedibanizobamipim.pdf
    • http://gptools.net/userfiles/file/50960398791.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ubov3lu4ln3uptqcg43ju36a65/nutekijogesot.pdf
    • https://cochleartudaskozpont.hu/files/zesorel.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d73652e3e6a4d22d22f541255ea38a44/xinojubibevavidemovonedob.pdf
    • http://dioceseofniranam.org/userfiles/file/78270713701.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae3d626bd---pedal.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/d3fe176547617d868241c3c73d06e8b0/37367994455.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=national+crime+prevention+strategy+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_off0000c00b.bin
45707d9c3aa70c1118ac76f8b25f4ad35168887213208ac00f9a1468286ab1ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xC00B 11120 bytes
font_01_sfnt_off0000d9d2.bin
3d13f84ccc75dfe21d406786dd8defddd166dd372b8d20b5ed8c72cf9c45c1ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 16376 bytes
font_02_sfnt_off00010473.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 16792 bytes