PDF malware analysis — malicious · a9a079d659feb875

MALICIOUS

PDF

75.2 KB Created: 2021-08-30 06:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: fcfc819a09d20e04076106cd6d4a2723 SHA-1: acf68f9ca736da78a2a3792df1187fdc35bfcb8a SHA-256: a9a079d659feb87532c80ac2d513d825bbe7e1ebc57e2b03ccb807284bb2a1be

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 an ML 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 a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external links indicate it is likely used as a lure to facilitate further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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 https://catamma.ru/uplcv?utm_term=melting+point+of+ccl4 PDF link annotation
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/09e504e424ff46a3fae8f2318ab76e68/tijuwutodogowupusilo.pdfIn PDF document text
- https://kisikana.hr/userfiles/file/98403008040.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9a98899aa2c2f259a8a5046379cdf0a8/79165174821.pdfIn PDF document text
- https://wickedcheesy.com/images/file/8809207980.pdfIn PDF document text
- http://amirafouad.com/uploaded_files/file/witulonemamipukujusufo.pdfIn PDF document text
- https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a7613da50123a5075fa26c5ef5260160/1294197325.pdfIn PDF document text
- http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608245b3d01be---40662182714.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612af9ef26ff7---82882806151.pdfIn PDF document text
- https://optimustelecoms.com/ckfinder/userfiles/files/jotofawimozukegutatusotef.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cfaa179e3---jabenuzuzojawefatodof.pdfIn PDF document text
- http://woodwork.pl/ubezpiecz/obrazy/file/jinodo.pdfIn PDF document text
- http://kolesnikov.pro/ckfinder/userfiles/files/68956734476.pdfIn PDF document text
- http://www.toeterloeh44.de/files/lijuzakinogifiguzugetezo.pdfIn PDF document text
- http://tiwtactic.com/userfiles/files/6365841112.pdfIn PDF document text
- http://dynamicyunnan.com/ckfinder/userfiles/files/50818067665.pdfIn PDF document text
- https://liniagdanskzydowo.pl/files/35047502799.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/82d48c38c5e0ee14321070a35c48b4c0/80912876324.pdfIn PDF document text
- https://bawwabatrizq.com/userfiles/file/17620437792.pdfIn PDF document text
- http://ducthoaudio.com/upload/files/27037033969.pdfIn PDF document text
- http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3042e54b1b---41226113484.pdfIn PDF document text
- https://derfo.info/resimler/files/8097862202.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9aa60d15cf83a56f8b255775617689a9/xirefukuzurekiveluguteve.pdfIn PDF document text
- http://superlitefan.com/uploads/files/73620440170.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bee6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEE6	10296 bytes
SHA-256: `e12994d81834929102bc8bcff350ca399a65716c1511ea8690af3a882cbcfe6e`
`font_01_sfnt_off0000d637.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD637	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ee49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE49	19324 bytes
SHA-256: `0bc684d91cfbab7e34c0defb55a0f4ea40679a3c4b05babc018315b4ea9d1a1e`

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