Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8db1485947337a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-23 03:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9604d87179e6e9a2563b4a5b2e8a29fd SHA-1: bcd3ba6d7ff66906e84982d831aaa774013c936d SHA-256: ef8db1485947337a838b23cd2f9f85c156c4f0146dd8d1057d3a111164fb15ac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs, including one that impersonates a Windows 7 Pro download, likely to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=windows+7+pro+oa+download
    • http://zhengfutz.com/v15/Upload/file/20219131947598989.pdf
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/32267105150.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148eb1433903---sopaxujisajizoweke.pdf
    • https://dongcohonda.com/userfiles/file/metusigalop.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e042785e51---47876119597.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afea96634c---gibelukaxovi.pdf
    • https://njshore.drinkpoint.com/uploads/files/91176873385.pdf
    • https://108pizza.pl/uploads/userfiles/files/9915008939.pdf
    • http://angelescare.com/userfiles/file/99496690799.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144be5ca62fc---tefixog.pdf
    • http://dvg.asia/ckfinder/uploadfiles/files/38619351242.pdf
    • https://truonggiangcompany.com/userfiles/file/35288559172.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/996e76942c4684a8e28e3ec41432e805/9145936188.pdf
    • http://e-instar.com/userfiles/file/wusadupisisiwuw.pdf
    • http://worldtile.net/jangheung/userfiles/file/wifemux.pdf
    • http://objets.immoweiss.lu/userfiles/files/74136503257.pdf
    • https://cristalensi.com/public/File/zekafo.pdf
    • http://josquin-capella.de/download/42046028222.pdf
    • http://157.230.241.115/image/upload/File/51494014188.pdf
    • http://yasairamenbar.com/uploads/files/vewikigonaxexupolafi.pdf
    • http://musicincw.com/fckeditor/userfiles/image/40174397066.pdf
    • http://cochemical.com/upload/files/20114126528.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f46a704ec---fasunadoguravinaniwukipu.pdf
    • https://greenlandpark.com/uploads/files/bipisasegelo.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_off0000b754.bin
248734fb793bb10d1f293e180e68fc6b46413a71674b2c8d802d065cd619cb99
pdf-font-stream PDF embedded font (sfnt) at offset 0xB754 10284 bytes
font_01_sfnt_off0000ce9a.bin
438b2263680908649930dc1560939f4f5a40b447ce0109263289d014382b39d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9A 14504 bytes
font_02_sfnt_off0000f324.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 16792 bytes