PDF malware analysis — malicious · 895aa7874f45dac2

MALICIOUS

PDF

98.6 KB Created: 2021-07-30 22:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 6d08d99a071bb6e304654c6e196f0146 SHA-1: d62c573d846489ad267a87ca17ff076fb22e29bb SHA-256: 895aa7874f45dac294b69eb3eb57a7c88cfef3fc101c2ed0d0407a10ab393767

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, many of which are part of link farms. The URLs suggest a lure related to game downloads, likely intended to trick users into visiting malicious sites for phishing or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://krisoc.ru/uplcv?utm_term=gta+vice+city+indir+kurulumsuz+tamindir PDF link annotation
- https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/64u5dofir0g9ubhng16coiv1bd/nonapekomikiredajuj.pdfIn PDF document text
- https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/93ac99bcf43b1bd2ca9b7dceb9a0910f/kokoguzugazab.pdfIn PDF document text
- http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8353c5d74---lovagoja.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e6af44819d0ff0db6378b3cecec357bf/23555426179.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5455502bd221762c2618a3d5cac6e630/zawabobudosumajozivukig.pdfIn PDF document text
- http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab983d13e49---96924581471.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/km7q5h5fvas91itpj0bmh41tm6/52405621248.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/66b419d998f0d32855cdfeb6acb9ddd3/5586928723.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d8bb687305f1458c14cf5f9d8b28c150/62545917986.pdfIn PDF document text
- http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/ziwel.pdfIn PDF document text
- http://co-wemart.com/careeruserfiles/file/21330216537.pdfIn PDF document text
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160737e01bf1f6---gozupazere.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6b58b120abd13cbffe151a6613b3a1df/67288139101.pdfIn PDF document text
- http://es-manzokudou.com/yamituki-n/uploads/files/6715039551.pdfIn PDF document text
- http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bf704e70d---wovabu.pdfIn PDF document text
- http://tele-video.ru/upload/files/sizurexejarugikufaxo.pdfIn PDF document text
- http://aggengr.com/uploads/CMS/file/zosuxomarezalukakunopade.pdfIn PDF document text
- http://live-lessons.net/lcj/web/uploads/assets/file/44605365777.pdfIn PDF document text
- https://ddshower.com/ckfinder/userfiles/files/59049973867.pdfIn PDF document text
- http://peach2560.xyz/js/ckfinder/userfiles/files/sosetexuxuv.pdfIn PDF document text
- http://suachuabaoduongmaynenkhi.com/img_quanganh/files/getudifaxalo.pdfIn PDF document text
- http://stigstudiotecnico.it/userfiles/files/36354020621.pdfIn PDF document text
- http://www.tobywells.org/media/fckdir/file/pagivakonurumezafalu.pdfIn PDF document text
- https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/66bde8bdd50552de3272cfd893dbeafb/1386932010.pdfIn PDF document text
- 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.

Filename	Kind	Source	Size
`stream_004_off0000f485.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF485	21436 bytes
SHA-256: `a56fd7f37dda5af3fa31f02675c15ed46dba88836f523360b80d57008576bf1f`
`font_01_sfnt_off000119c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119C5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000131dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131DC	10880 bytes
SHA-256: `ca280fcf9d9dcef94ccb67b30d3bf2d922b97f452b24aa8e6356bd76eeff9470`
`font_03_sfnt_off00014b1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14B1A	18696 bytes
SHA-256: `d9721a462e077dd81c969905e4f0fdcd8e462fac6af0dbb39b7edd1eac83c054`

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