PDF malware analysis — malicious · d2b72cfc8e181804

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 19:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 144e7306765b13efcdf83e99cc219581 SHA-1: 501e2dddbb983bd9b9972a0402a92af93b8b15dd SHA-256: d2b72cfc8e181804a81d77270d59dc0d3a9a1e3a9b66ad3756afd217683769f5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no clear textual lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 https://girilawfirm.com/content_files/files/jemibimafiwezasusupivivok.pdf In PDF document text
- http://urduhadith.org/survey/userfiles/files/jusobivovikuzubiwalojani.pdfIn PDF document text
- https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/40245246032.pdfIn PDF document text
- https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a254c85e---sefuzunepi.pdfIn PDF document text
- http://bjbtrh.com/files/pic/file/22384073542.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c8fca0d392---57328409628.pdfIn PDF document text
- http://neonatal-surgery.ru/userfiles/files/bigiwaluwilizezupizu.pdfIn PDF document text
- https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/71tf3r363mo1711sdd2ig7b31g/kifarebidusagaribum.pdfIn PDF document text
- https://marathonlaval.com/userfiles/files/4267443525.pdfIn PDF document text
- http://sun-green.nl/ckfinder/userfiles/files/pojunor.pdfIn PDF document text
- https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/f13bf80fb6c398eca9f6e06c43783f58/kipimarojelekabikodu.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174d58a572---96905791386.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f321869f57d---goxazovakosexijibi.pdfIn PDF document text
- https://turismopontevedra.com/ckfinder/userfiles/files/32444860246.pdfIn PDF document text
- http://amon-syotengai.com/userfiles/file/fuvikoxapusumisagijebizo.pdfIn PDF document text
- https://iwistw.com/upload/files/66886426745.pdfIn PDF document text
- http://gamax-motor.cz/data/dokumenty/39785612035.pdfIn PDF document text
- http://randalljroutson.com/clients/44711/File/fugarogefaledavidukujokon.pdfIn PDF document text
- https://ecowaytechnologies.com/ckfinder/userfiles/files/fiwiponeneg.pdfIn PDF document text
- http://kayapaliinsaat.net/file/73736360256.pdfIn PDF document text
- http://xsteelstock.com/d/files/wuletojoxudoxilavoli.pdfIn PDF document text
- https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/4od7luk8kijgh5v70gaif37vg4/8058669361.pdfIn PDF document text
- http://cafegreenwichvillage.com/uploads/files/73554596482.pdfIn PDF document text
- https://honghow.com/ckfinder/userfiles/files/17507943473.pdfIn PDF document text
- http://investin-khj.ir/ckfinder/userfiles/files/jatajusepefemiduvo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=finding+repeating+decimals+worksheetPDF 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_off0000d779.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD779	18736 bytes
SHA-256: `1a0e7f33b51424e12a35124d2a36863af48f285e95f196d6bed012af7dc0e575`
`font_01_sfnt_off00010801.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10801	11116 bytes
SHA-256: `18defc83223fb9d697fa2c24f09ab2314430abff2b0c4f341f8cbd489985134d`
`font_02_sfnt_off00012192.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12192	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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