Malicious PDF — malware analysis report

Static analysis result for SHA-256 3788af29ec317f01…

MALICIOUS

PDF

79.4 KB Created: 2021-07-01 22:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a068c05c283a70175f68a782d0879a6f SHA-1: e79db5662b0e1ab24f8edecb8bc2ea16b6f30a7b SHA-256: 3788af29ec317f016f4899992a2e6697f7e4e851d5a8560ecea40306364a01e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites, likely to facilitate phishing attacks or malware distribution. The embedded URLs, such as http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608520eacddf6---83381350022.pdf, are hosted on compromised CMS platforms, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0ee47914009139b3b5576aa1ba833229/bekatapebugebeve.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe1ec46a3f---38510651694.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160928fd2aabc8---93836594160.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc24406d36---6820412996.pdf
    • http://irinaburmistrova.ru/files/dukalenitowugax.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8bgcmfs1gtq66biaj88relhngs/wojelexogex.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075989242d0e---13833514598.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e37227db9---92578086934.pdf
    • http://beiwendq.com/userfiles/file/59409192385.pdf
    • http://harchovyk.com/userfiles/file/zavuj.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085587ea960a---991250385.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/dc31043df141ea51506721d9b1120215/foguwuxibagola.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ac4efcda8089e140b77baa6d1601ab07/xijirogasokejipovidu.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adebc0ce697---ruwetupukajaditideluf.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/89127041140.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab009508b11---73769335316.pdf
    • https://local-atlas.ru/userfiles/files/23269410349.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac0d01715---7233894460.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608520eacddf6---83381350022.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3f59bde00880061dbf9d1c0fcd78d8ec/56201852628.pdf
    • http://donghozibistore.com/luutru/files/12283804168.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160786ab7c15f7---ripofedovanizofadimisil.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/eblmbk6s9c33nqkj7gsdg0adb2/50785169092.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c96d3c37842---jifowururenanimiware.pdf
    • http://kokocurry.gm/userfiles/file/25429539136.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=in+between+two+rational+numbers+there+is
    • 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_off0000d1f1.bin
07d5bce4caad0249cf5f2213d50b6f92fd58782c044f61e94d0b6565b0ec98be
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 17436 bytes
font_01_sfnt_off0000ffea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 16792 bytes
font_02_sfnt_off00011801.bin
9d09780aea76fb7568360471b5927cfae7f19c84d0fc006fbabddb115d5cbfd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 10648 bytes