Malicious PDF — malware analysis report

Static analysis result for SHA-256 37dea8512b28ee97…

MALICIOUS

PDF

85.8 KB Created: 2021-07-12 23:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02c1db92b0d8b5656c21319a6180f83c SHA-1: deec6ce2404f177bb55f351d62d79d3471cfdf01 SHA-256: 37dea8512b28ee977d1eb46991f3e56d80fbd0185e5e9c9df07ce9a0cc6bdeae
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3beb5a988a---giguxilusobizazaxe.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9b74818cc0fce736d638fa976caf89dd/59292187295.pdf
    • http://jjmcp.jp/userfiles/Image/file/77842478265.pdf
    • https://amatnieks.com/pictures/image/18284926592.pdf
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/36652191806.pdf
    • https://accuratesearch.com/userfiles/file/69297202384.pdf
    • http://peneleos.pl/userfiles/file/86380683598.pdf
    • http://ibtaker.ps/userfiles/file/rodasas.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fa25e05295352bc1917371281a0e0303/matedu.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700dbb2097e---teponofibedatonuju.pdf
    • http://madison62alumni.com/clients/e/e8/e84cd6a5166dbe8c5f6852bff763f4b2/File/sulanononevosov.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2kqtv21cs5devbpfrfmi5q43c3/47963292955.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72b4a0fca---80319342960.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xufuzanajopefemef.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e330205a4e---57673128121.pdf
    • http://chemicalengineers.ie/images/vakodaroz.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e3119c41c76544e35bc7dbf3a7fe4ee/nunidikesurej.pdf
    • https://mamo-tato.ro/userfiles/file/bejajadoloniwofil.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/104b05ef586db27554764f235cb26f13/3522856611.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1b6ucjh12mefduilbha46763ue/78006215162.pdf
    • http://gocep.org/data/userfiles/files/80830530477.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160725412aa052---62615516258.pdf
    • http://jyjwqj.com/uploadfile/file///2021052323151184.pdf
    • http://sosnovgeo.ru/userfiles/file/86142519289.pdf
    • http://rotarylaspalmas.orgdocumentos/file/vuxekojojiz.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903997a8de2---tuxofolopitis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cortisone+injection+for+gout
    • 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_off0000efc3.bin
3943cd97ef09d0af3ebf490aed687d3e9113b703a3dc7b4809767a39d5fbeeac
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 10564 bytes
font_01_sfnt_off00010804.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 16792 bytes
font_02_sfnt_off00012016.bin
87a1a1cca8eb35f6d31f0144c8efc2458065034863c0f867683631b5f2bee3ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 16168 bytes