PDF malware analysis — malicious · c57a792e3b3b1839

MALICIOUS

PDF

81.7 KB Created: 2021-08-05 15:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 9d8a0453366a9e198125cd4a1a313039 SHA-1: 6c40ddd3a64d2603ca9064ef37595d3c8d4cb6e6 SHA-256: c57a792e3b3b18399ae1fd1e1e4803033b5ad909bbd4568ecb4dd6579c7026b6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=animal+jam+hacks+no+human+verification PDF link annotation
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ff17631bd---99725641884.pdfIn PDF document text
- https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/97e6919c13729787eefa22e95eabeb86/lajejilebivaku.pdfIn PDF document text
- http://xn--49s538bo8ux8c.net/userfiles/file/32665221728.pdfIn PDF document text
- http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accdbd88f26---40655814127.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/ae0c2e4c809a87c312ef3f39080d8b5e/62460963632.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/t7pa3hcfc3j59b0t1rfuc0289l/tikefofibikaminazorolun.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1fbe79f94---zulaki.pdfIn PDF document text
- https://himalayanthailand.com/image/upload/File/59258840839.pdfIn PDF document text
- https://360clothing.in/home/www360cl/public_html/uploads/images/files/1883270733.pdfIn PDF document text
- https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4944eac1e1bcf9c46a1a27296718fb46/61975507143.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc83c9d058---69736854186.pdfIn PDF document text
- https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/13bf1ec92d47c6ef1b9770aee79f66bf/86082382459.pdfIn PDF document text
- https://paklya.su/design/img/upload/file/28266263177.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d766b78a998---wewipevereradukarodag.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24acc12e0a---38872876071.pdfIn PDF document text
- https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/6hb3b2808mnbgau8qq5579mejv/waberifolodesikusam.pdfIn PDF document text
- http://abimobiliare.pl/pliki/File/minejisejelafivasu.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d98a8b490---xolifojuderadenojazaju.pdfIn PDF document text
- https://habibitours.net/ckfinder/userfiles/files/33287924175.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608625ea046ec---mowimuwujeba.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/510cbc254368b83f8c154a4cd7a163b8/nedolu.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e776639425---dozipafezenenegox.pdfIn PDF document text
- https://ctapigroup3.com/contents//files/juderibikiwasoj.pdfIn PDF document text
- http://ipsgroupjjn.org/userfiles/file/32558401804.pdfIn PDF document text
- http://bukharajohnscreek.com/sites/default/files/file/virefudamowisituberew.pdfIn PDF document text
- http://bit.ly/2y1yisHIn 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_off0000dd3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD3A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f551.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF551	10972 bytes
SHA-256: `837dfb7b8dbcededaea7ee3e2fa7a6ccc3b6dccbeedd653e5e9a0e90182f86f0`
`font_02_sfnt_off00010e99.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E99	16424 bytes
SHA-256: `6747f09d40c9a63335b41bb29b92ca14d91e450ca59856bbf8b882d3130872f8`

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