PDF malware analysis — malicious · 846f26e19d06be72

MALICIOUS

PDF

100.4 KB Created: 2021-06-26 07:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: a2ab55ec0a78acdad3571c68a8f4e38f SHA-1: 75ccf26985ee243650c16fb639dcd012b4285704 SHA-256: 846f26e19d06be7249cd9ac1befed4276708d092e74a020761bded8de36ff648

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext, likely related to the 'state of indiana tax refund' URL fragment. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9784

Heuristics 7

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.
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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
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://kodcomputers.ro/2664/uploads/befokigesetukexobuzamolu.pdf In PDF document text
- http://zeguvietnam.com/uploads/ckfinder/files/bematumuxubufim.pdfIn PDF document text
- https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/26b504412ceb2ddfd9820d1bebe81ceb/genesu.pdfIn PDF document text
- https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160949d4a855f9---72482697789.pdfIn PDF document text
- http://abnicum.ru/files/file/notuluxudijopepikijorut.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1tgh78mcqkgssm637ejkuspjr4/zuwiref.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d528f22dade---bagajixopafukaraneduxek.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9941e58ee5d22ff1caf4ff3d1280309a/78219441698.pdfIn PDF document text
- http://hsiwww.com/image/files/20210623_154952.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/94108756f2819beaf7d01e7e0adff027/zisimulowire.pdfIn PDF document text
- http://ithaca1961.com/clients/875375/File/fexowevuxodiseluz.pdfIn PDF document text
- https://infoenergie-loire.org/userfiles/file/77303145905.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072798444d86---nesumapezuwonetiwu.pdfIn PDF document text
- http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/tumegozuwekuditamarikogu.pdfIn PDF document text
- https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/870a4c76f5f9341032616f80c7dd593e/gozanipeso.pdfIn PDF document text
- https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/b11b6gs6eqnjt6mnor9plvrkad/75847343921.pdfIn PDF document text
- http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/zowasawil.pdfIn PDF document text
- http://chetaomaynganhnhua.com/uploads/files/35927980806.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2bf4c0a45---saneduvogojaporivuta.pdfIn PDF document text
- https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/7641d75038551f8d49fe59b6b5ff10ab/fenuwir.pdfIn PDF document text
- http://aaaexpressac.com/userfiles/file/bivegi.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/6jc20j3r51337hii4o7gl5f7fh/27278673685.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/gpjf7f598lh07eqtsa45vahcbv/bijepupamoxudesadalexoz.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608784522f484---getetiriradoxigenazomiviz.pdfIn PDF document text
- http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a455c7c9f57---xidoponivodu.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b578b43c5---xokomafenetewozovedar.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uac8ujg77a46gkskkkhspmd00r/91092337482.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=state+of+indiana+tax+refundPDF 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_off000125fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125FB	10412 bytes
SHA-256: `4f6ec9ee300c80b6d655ef086806326421293cf361c1f7fe261ab2104376ae7e`
`font_01_sfnt_off00013db2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DB2	17808 bytes
SHA-256: `ab4c91084c23073480807771ea9ea786302ea64a86fe8a7372e7a03a87d7bea9`
`font_02_sfnt_off00016c1c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16C1C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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