PDF malware analysis — malicious · 135630df6abbdf9b

MALICIOUS

PDF

87.6 KB Created: 2021-07-30 12:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 57805b3c0f589cb5a1ac3ad19a9231d2 SHA-1: 4ceac04ae286c18c31327b95c9ea76022742b9ca SHA-256: 135630df6abbdf9b2200e0e618b9b04012ec410040880788ea73e5fe37d6db21

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://fsnmmaterials.com/UPFILE/userfiles/files/27804549758.pdf In PDF document text
- https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5d8f38955f85555686f879e457c9a91d/wixuxupolu.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/26109776845.pdfIn PDF document text
- http://studioguatta.it/userfiles/files/lixilizawejuraza.pdfIn PDF document text
- http://mai-colle.jp/userfiles/file/petajezeg.pdfIn PDF document text
- https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/4157f95c83fcf06952933815cff160f0/56718879478.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608988a898af8---84517125494.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c6c01ce3---lojetunor.pdfIn PDF document text
- http://www.pics4us.de/userfiles/file/72003791789.pdfIn PDF document text
- http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075704bc9a46---vuxobozosetemakesedivir.pdfIn PDF document text
- http://harasim.cz/uploaded/files/5106833795.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc66f1d3df---31674293572.pdfIn PDF document text
- http://laclonghotel.vn/upload/files/13596865071.pdfIn PDF document text
- http://lg-palette.com/upload/files/joruxedeb.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/gnmnptbvcvefi9aogl1vgg5m17/36622020117.pdfIn PDF document text
- https://agentcctv.com/userfiles/file/50436119721.pdfIn PDF document text
- https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/1saefedrmp541pvr0ud1k0v4kl/pozegigijolibubik.pdfIn PDF document text
- http://flatadministration.com/uploades/fckeditorfile/vinotomosun.pdfIn PDF document text
- https://atamergranit.com/userfiles/file/xegutuze.pdfIn PDF document text
- http://beergolfers.com./blog/images/file/43952689383.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160735b8f85ca5---delazidetatini.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086867a7132d---dopuvogilulomuxaneb.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8r93gn7smj0sh8gnnrlpdcogg1/xenujifez.pdfIn PDF document text
- http://crmrealty360degree.in/userfiles/file/pufobatefogarizuradipuf.pdfIn PDF document text
- https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d9d659863f5720538e1aeaa44df76008/nelafikaruludu.pdfIn PDF document text
- https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c405627012c90ca6ceb08a6ee421aafe/koxafonoveril.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dicionario+de+acordes+cavaquinhoPDF 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_off0000ed31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED31	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010543.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10543	19748 bytes
SHA-256: `25f145b0a88dea74b1cadd432d7915f13567597556c13f7112f5174139cb7abf`
`font_02_sfnt_off0001370d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1370D	10636 bytes
SHA-256: `2602622006e2768554d0d51a12815d68b3880456825a7632a03fea9c843ec3eb`

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