Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a32a48cd5ad8d2…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 15:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5faa239aec2b866cd3a35cdf8831dc9 SHA-1: e5b3286d30cdc8d6c7b77f46012b02b981c57883 SHA-256: 78a32a48cd5ad8d2470a79df89bf5633c64ff3bf9590a30800c61892f3960a91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifying the link farm nature. While no scripts were extracted, the structure and heuristics suggest a phishing or SEO abuse attack pattern.

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://atlastoursntravels.com/userfiles/file/26785961183.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/9d4a406fd1ad8f141151d8b4897a6a61/wotirezoro.pdfIn PDF document text
    • http://web68s.com/upload/files/91480516758.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/zulozi.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b43567783---ruzonipegalelofobikiku.pdfIn PDF document text
    • https://digiconelectronics.com/media/37878967824.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/31073005431.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/02061d5d4bc11045a295447c4c874112/77539922929.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/75418229258.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/vofidesitositanugezu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/899cc162bd5a17f7fc053d566dd86a73/fivenarojuzanibi.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a709c690889e668f36229164c6d54f96/gidikasovexa.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/xusagawogarakadoko.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2e308338d3f84c45ead4993c86930679/mureroxak.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/razarilagukaxowinekodo.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/ruzajukikuzal.pdfIn PDF document text
    • https://labelmarket.pl/data/file/sofiroruxexikuvi.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/jizikawosavanirufakujija.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66099b574---35367752991.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/3qceufn68ues0s615dv44uf0c6/59953143490.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/tivevudabuvamoza.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a39549ee2e7---40807244218.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210515044911.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/4689158490.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vosujadebixesus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cv+examples+pdf+south+africaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 11080 bytes
SHA-256: cca1af3c6dc66e027c509a50a8c721bffe61b0c67eee144290057d4d0f552806
font_01_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 16680 bytes
SHA-256: d0815d6401199aa2105d5865efb6021bb4ba07a7b32331b7e7491142c3bfdd75
font_02_sfnt_off00011e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1