Malicious PDF — malware analysis report

Static analysis result for SHA-256 662c563926871810…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 03:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a0eebdacf38c882b7458f4767db8573 SHA-1: dcc457d11c418c22a4aff432090c7561d3a84e10 SHA-256: 662c5639268718106147be0e204c995e3b5b56ffd4c39b8a618e49b4d9481591
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, suggests an attempt to redirect the user to malicious sites or download further payloads. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pretext, aiming to trick the user into initiating contact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=android+keep+app+alive PDF link annotation
    • http://ambvetfanini.eu/userfiles/files/71621488471.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/boq2ktpvba7fn8mv1pv1ihcmd2/46508267583.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/dubeguxonewexij.pdfIn PDF document text
    • http://space-edge.com/upload/files/xumuj.pdfIn macro / runtime command snippet
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c4ab1d0008ddbe210fdee9381210f992/mulutogupobifekikej.pdfIn PDF document text
    • https://casaalu.com/luutru/files/36093480386.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/2619340811.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/2000039470.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147afe2e18d8---19252212372.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/tozotojelekojijetajot.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/giwukitodi.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/45795578702.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/3a48b185fe7fcc7cc49ac0e68091f5cd/41932918947.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/93737361009.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/22525470037.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/1390451039.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/31e62cb91676635f1d7e52f6e118d75e/mifotanetodomoliri.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/86692279077.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/remojuwawamumadonex.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/53437727253.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xamutuwavupur.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/42812960315.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/66270784193.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/sarifevamijatewiv.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/58967224978.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/dubeguIn macro / runtime command snippet
    • 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_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 10260 bytes
SHA-256: f202233c539d5a27d7fcdfd12c2b7936208d32675d4d904bb2f8a4afb00cbb0d
font_02_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 18248 bytes
SHA-256: 5e399e69fa551f6ddc24e37e664dbe01e4df0241b7c3cec41c823f36a1a4297a

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