Malicious PDF — malware analysis report

Static analysis result for SHA-256 1374c3b1ff34282a…

MALICIOUS

PDF

86.0 KB Created: 2021-08-15 20:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f977229e8b8db3564427d36bb9f8595 SHA-1: 23ae8f1305860afcbf0111db13b75310b3247598 SHA-256: 1374c3b1ff34282aeb7733cde32729a192bc4764adb2e66f07ce008928db0ce8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6a45b9ba---fofekavidurotatex.pdf
    • http://ampletrekking.com/userfiles/file/5101879664.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717de1152fa---62663732699.pdf
    • https://akproauto.com/nbloom/fckuploads/file/6656162458.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/84766806407.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c49a29dd3e---sofobijinujetizateti.pdf
    • http://innotack.com/userfiles/files/57262740761.pdf
    • http://pogservice.ru/userfiles/file/turodawotebivuxumoz.pdf
    • http://begemot-rus.com/uploadfiles/file/2021060309271873499.pdf
    • http://ozona.pt/wysiwygfiles/file/xikenoximikepawokajov.pdf
    • http://vamaconsulting.sk/userfiles/file/bajoburoxite.pdf
    • http://cbgnfinance.com/userfiles/file/80648688881.pdf
    • http://paneldeconsos.com/userfiles/file/44547515425.pdf
    • http://mrbossamktown.com/uploads/files/jedonelupufonilolu.pdf
    • https://vettercycles.ch/userfiles/files/23257471969.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161036b771c680---79265742815.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608952f8a428c---81372357698.pdf
    • http://technoculture.cz/admin/upload/file/12526973581.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/wafibusogovutitoreni.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/de55ee0b86238549b464483ac59a7e0b/jiwivokisefima.pdf
    • http://aarogyamedico.com/userfiles/file/31662618491.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92951519ec---3230288748.pdf
    • http://crosswaysrecruitment.com/userfiles/file/4355878656.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+best+n64+emulator+for+windows
    • 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_off0000e972.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE972 16792 bytes
font_01_sfnt_off00010184.bin
ceba6a78835d41273ac8d22a1c7a5f9f2004837a8dce7b53985a4748d2a61267
pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 17484 bytes
font_02_sfnt_off00012f28.bin
18d501523170a388f358332ce53a7343408b033763cd329927ee95eb43c89538
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F28 11184 bytes