PDF malware analysis — malicious · 4fd49559c2817e9d

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 09:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: bbb9f27d9c3ca78415527548f36476c8 SHA-1: 87604aaade052b930ade7b96a1a4f1c998286277 SHA-256: 4fd49559c2817e9d3cddca3c128e58d0ce29aaaf4e8ecfd06f624c24ee8196db

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm used for redirection to malicious content. The PDF structure and embedded links are indicative of a phishing attempt or a distribution point for further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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 http://quick-thailand.com/images/uploads/file/7417331157.pdf In PDF document text
- http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608459658d786---tojenoravepipodofeseri.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c262eb7684f---35133983222.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/859176da2c8e9846cebdb427ffdcd1a8/80941248382.pdfIn PDF document text
- https://fceresources.com/ckfinder/userfiles/files/94613287525.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608130563ddf7---povaboziwi.pdfIn PDF document text
- https://ascinfratech.com/clientprojects/trading/file/9358583151.pdfIn PDF document text
- https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2a3465a4b733c2b1d7e1667713f66c4b/vinaka.pdfIn PDF document text
- http://tropo-design.com/ckfinder/userfiles/files/68219819807.pdfIn PDF document text
- http://confidenzacsapagy.hu/upload/57919002659.pdfIn PDF document text
- http://xn--d1achljw0b.xn--p1ai/content/upload/59370612581.pdfIn PDF document text
- http://np-laser.com/upload_fck/file/2021-7-21/20210721034744482131.pdfIn PDF document text
- http://imaginove.eu/data/Files/sagotamipafabu.pdfIn PDF document text
- https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/bf56e425f7eacbe118bce71748e19abc/menezivolosase.pdfIn PDF document text
- http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711fcc097bd---85250056241.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7fc85c171---junufokifik.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ae572de364bd42cedfacb20699fa6fe4/pomolonavagipat.pdfIn PDF document text
- https://inoxquochoang.com/app/webroot/files/images/pages/files/vuzotubejamivo.pdfIn PDF document text
- http://mbfeed.vn/upload/files/zifujikivik.pdfIn PDF document text
- http://lnshiyue.com/userfiles/file/20210707201805_1207126832.pdfIn PDF document text
- https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/952l0ekbkapmk2amoln1r3j7be/sobifivawisusas.pdfIn PDF document text
- http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b2fd8467c---70920600373.pdfIn PDF document text
- http://minuspk.ru/minuspk.ru/userfiles/file/71476876379.pdfIn PDF document text
- https://seikico.net/img-tym/files/76169894964.pdfIn PDF document text
- https://hr-serdahel.hu/images/file/gebiwevedudaxezawal.pdfIn PDF document text
- http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/wifexepiruxamupolijejes.pdfIn PDF document text
- http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/3741189947.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sistema+reprodutor+feminino+anatomia+veterinaria+pdfPDF 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_off0000df24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF24	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f736.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF736	17848 bytes
SHA-256: `7017cf069eec142d633d496a8371634f586528ae31726a91f51e73d3ff5834be`
`font_02_sfnt_off000125b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125B4	10852 bytes
SHA-256: `29053d84967cda873f264a502b063116ed214b8dcc1888ea5459625ba1908059`

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