Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea78f66259d93bc…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 13:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed052edfe578ba49c8a77140f16a7d80 SHA-1: 0cc7635a8470c044c385100fb37322b29f9f515b SHA-256: 6ea78f66259d93bcedf1f90d4709e8a210c9f3cba4c4d9af1a5224f7aae91961
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://philabc.ru/uplcv?utm_term=cengage+mindtap+chapter+5+answers
    • https://bayihoki99.com/contents//files/bobaruwobizepirojameguwok.pdf
    • http://ballmillfactory.com/d/files/37078390917.pdf
    • http://mispuntossaga.com/campannas/file/gekive.pdf
    • http://3qlohas.com/CKEdit/upload/files/91501236289.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8ba56cdb2---doluxavigarumazoko.pdf
    • https://bandai-k.com/userfiles/file/pofukobalititederexen.pdf
    • https://sonarmusic.hu/up_image/file/keworifaxogototuduvaxo.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c42bdc9a0e---9309517996.pdf
    • http://www.alfapilates.pl/upload/file/42077868625.pdf
    • http://1mosref.ru/ckfinder/userfiles/files/73087599880.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161068d76b3c07---52288080475.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b83255659---nisepevufokebabu.pdf
    • http://picassogift.com/Uploadfiles/files/85518806355.pdf
    • http://we2meeting.com/ckfinder/userfiles/publics/files/votokoxigosivop.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c04ee0852d4---4099038158.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lezuj.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be860bbcdec---jevusegixeparekenoro.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e633150550---durulijujujufononaganariz.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/81e1f5ae26c56f7404f5b97b05285f0e/46565787048.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d9312fd59---dadevotumoburut.pdf
    • https://ka-base.no/images_students/files/xopuseba.pdf
    • http://happinessgown.com/upload/users/files/90663176773.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160860ce104217---tamamef.pdf
    • https://emmaushuis.org/pages/29359358446.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/640941422ec6683deefdf4d21f0fc324/dukiwakizu.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_off0000d333.bin
9eb8d862c51f8cd4b6011c8b4cc8781e5ac7c665579ea2d30da9655d82acca41
pdf-font-stream PDF embedded font (sfnt) at offset 0xD333 18092 bytes
font_01_sfnt_off000101b7.bin
78a53b10f2f1315234a7c817cdca5268b33225e04670a3fc97595734137a97a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 11048 bytes
font_02_sfnt_off00011b28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B28 16792 bytes