Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e4cf68d63eb38a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 06:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 12ebc9b21c98177a42df5951b4d30f87 SHA-1: 9fef9946594e57fa0efff8a2e3ed79fef1ee4d8a SHA-256: 67e4cf68d63eb38a4d684874fc410712c409f60b846d135d4e95c525376c6276
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The file appears to be a link farm designed to redirect users to potentially malicious content hosted on various compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083918dd59b5---degifexivoxipo.pdf In PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161000d5e7655c---dosuzalivipokaxofep.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/kijiwogavo.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/rivok.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/15ffce81f67be96393902c58e460c209/febevu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4bc4792f4---24980741215.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6d5200e80264f06d05464e4e7778c69a/vowuwadudaxovazam.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/pesuvopalumajaxitatoxit.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/92426422556.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/likixepabejewipezizusij.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/poletusudiwona.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202108270630377582.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/xevebomazabime.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16133b95fd8e41---gojakagebixevitene.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2b94fecd8a1d446a3f08490e2b275442/lopojofesax.pdfIn PDF document text
    • http://terminsk.by/pics/files/18623424576.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/xudibudilezigo.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210731_9D7098B2FC9D68EF.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/domupenikewi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec126a0af---86186818475.pdfIn PDF document text
    • http://capital96.com/userfiles/file/najobeviramubovofam.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80f0be7b1---59679298067.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/nanepimeziba.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/84017513675.pdfIn PDF document text
    • http://freewest.at/botusudebone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=academic+english+course+book+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A5 11280 bytes
SHA-256: f4e61084facaaa65c9f8202437b6fd407e9354d131e50365ce8a2f2f24d52dff
font_02_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 15408 bytes
SHA-256: 038b36b900d083c3b6e2a74adb33ffb8fa4f19baf0e5c6bd738797d74dba4de2
font_03_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d