PDF malware analysis — malicious · d0b1dea951e54d16

MALICIOUS

PDF

109.4 KB Created: 2021-09-03 03:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 86e8f80e62d6d22224282292a283c073 SHA-1: 4789318b5f7ad6598f6151eeb121ab7e78aa6d93 SHA-256: d0b1dea951e54d169e904b883c204168ff725fcad531a709cb653bc28f7f8d7d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains numerous links, many of which point to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or exploit vulnerabilities. The presence of a link farm on disposable hosting further supports a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9963

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://thedewakohchang.com/image/upload/File/9941339549.pdf In PDF document text
- http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfab18f85e---18879288261.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d210b4820135209521371dbc5b3f4353/14912090313.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f49e4e4e5f---15461464908.pdfIn PDF document text
- http://petraifevronii.ru/ckfinder/userfiles/files/dajuzusapujepe.pdfIn PDF document text
- http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22096956314.pdfIn PDF document text
- http://timnhanhonline.vn/upload/files/20272408738.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88da2cef1e---litazifasegejobexakejane.pdfIn PDF document text
- https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/cc1j7hfh3dm0bs7ho5tg76dcl9/78136600646.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608752b64a307---pafibozefituralonexu.pdfIn PDF document text
- https://ratsimae.ee/media/contents/file/busizijovinokotazajesimos.pdfIn PDF document text
- http://anoh.net/pds/userfiles/files/natawiziwirev.pdfIn PDF document text
- http://wsystem.sk/userfiles/files/25532619715.pdfIn PDF document text
- http://pc75.net/upfiles/file/1622003419.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160931ba899a58---natotijekubevenujupu.pdfIn PDF document text
- https://gymlesgeants.com/upload/editor/file/68016229000.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/gigof.pdfIn PDF document text
- https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/60518739f8599bed4544774a6c04f40b/nesarubo.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/o10otro5hdqm95ihrs1ndej665/vofinafelifi.pdfIn PDF document text
- http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f594a66387---92411976018.pdfIn PDF document text
- http://bociany.sk/media/file/79730056825.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d625f5daef3f30f751ef5b79cd34511e/bugevavube.pdfIn PDF document text
- http://permagnet.com/upload_files/file/2108300137124762855g3e4b.pdfIn PDF document text
- https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/210fbf37462e8d76d4c8b1b9f2389aa8/82031849717.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7116699ef3c43280a1793ed1aabd03dd/42225069020.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tyranid+codex+pdf+freePDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00014446.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14446	19556 bytes
SHA-256: `84055b2bf3cf417126b5807ce50f857d1217f3145ccb25630934c7b7e2b667c5`
`font_01_sfnt_off000177e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x177E9	10480 bytes
SHA-256: `1d73256ec7f57b18da7242138d01c180e3c3d05dfed641ed615b265c7b43f473`
`font_02_sfnt_off00018fd8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18FD8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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