Malicious PDF — malware analysis report

Static analysis result for SHA-256 615d2e24aa71bfdf…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 22:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c145d0602821979801a7da3e6cb463d SHA-1: 24b7a4c571b1796c1fc340bdba53942d9b8a1de5 SHA-256: 615d2e24aa71bfdff9192c2b5c306e298dc2d01e383332c00c86e15084375a53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac71b52e2---69695158902.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077600584de4---renoretudivatuge.pdf
    • https://kompaspt2.com/contents/files/fasoli.pdf
    • http://lab4050.com/upload/editor/file/71830809055.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/c75n7p6bbt3520dj241hn3qib7/tugawug.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/afaf61a38d8f75f8d6ed5648608f2fcc/56837312398.pdf
    • https://cafemocion.com/userfiles/file/kipuxet.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95e9ec4ff---2397407180.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/luwedoxufuse.pdf
    • https://topclassgreenery.nl/images/file/40805354516.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd545b62362---27087320602.pdf
    • http://www.urbanwaterways.info/files/jakidomupoxonetavigewuvet.pdf
    • https://juhaszautovill.hu/userfiles/file/90126221288.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2ebc15210b4ff39f8eeebde039465a63/55182323956.pdf
    • http://irvinenott.co.uk/ckfinder/userfiles/files/retidotajatuxezipovu.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/zorixisufajekop.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/o41vlpo32u7s62301q7talafb5/27253978634.pdf
    • http://stalmost.pl/userfiles/file/94069313784.pdf
    • http://randoquad72.fr/userfiles/file/gogibemofupotor.pdf
    • https://efnnma.org/files/file/wepegalelosimirikeju.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e30db1303c---dilirubejobe.pdf
    • http://ipublicity.cz/data/file/kamaxitawiwer.pdf
    • http://darec.sk/files/files/zinasidulemumuzawafo.pdf
    • https://juhaszautovill.hu/userfiles/file/budotodali.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc800460fb---98657636984.pdf
    • http://mt-filtration.com/uploaded/file/50963651060ce7544272c2.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=280+brl+to+usd
    • 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_off0000dc99.bin
451cc88228544ee1a9a03caf185f62b966b5f8e00622a44de303fb559fd95260
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 17136 bytes
font_01_sfnt_off000108f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 16792 bytes
font_02_sfnt_off0001210e.bin
d07b1876f2a93d291bf0b16aac85281690294a07c5ab9d49d8fb7e9ae8d8f68c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 10344 bytes