PDF malware analysis — malicious · aeef7724f95aeab2

MALICIOUS

PDF

89.0 KB Created: 2021-09-08 00:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: e1b5a4d9e7df03f3fd575a49e6afda13 SHA-1: 4a7998c892ac1942bf04c948c05417d63cb6d9fa SHA-256: aeef7724f95aeab227f02efe3e6ade127d8daa3b89451aca9768ed50aa48b704

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it's a PDF link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a705aae909e---11600040235.pdf In PDF document text
- http://anatolianlgs.com/userfiles/file/12571731786.pdfIn PDF document text
- http://lightofislamonair.org/uploads/files/mujizetugivefajiw.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ad79b3c8---zozubaveri.pdfIn PDF document text
- http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/7115000096.pdfIn PDF document text
- https://europartner2.pl/uploads/80040540750.pdfIn PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb947cbe769156a0f3c3676a395869a9/37343630509.pdfIn PDF document text
- https://33mobility.net/uploads/files/95826346120.pdfIn PDF document text
- https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ca91e43e3b11f21091aee09add50a8b9/fomezubezu.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/871feebf0c0b7fb16849d991ef6fc990/31870402768.pdfIn PDF document text
- http://vet-arrighicolangelicristilli.eu/userfiles/files/79966632730.pdfIn PDF document text
- https://stijsr.com/userfiles/file/kuromumo.pdfIn PDF document text
- http://beloezoloto.ru/userfiles/file/kiwikonomakapadafewod.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/68170244432.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/421e2e9c7589d40cae399dff6e563eab/kixodis.pdfIn PDF document text
- http://riskhedgetech.com/uploaded/file/205617242161196c283a510.pdfIn PDF document text
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ad856162e0e2c2ea1d5cd7a1b300c26e/domoxopebosawinujekavusin.pdfIn PDF document text
- https://myarchitect.es/ckfinder/userfiles/files/fimamulivojejoz.pdfIn PDF document text
- https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/da53f67fb92a93606e49c0d05a1e06b4/gipepem.pdfIn PDF document text
- http://elijasprojekts.lv/files/file/38727388313.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dd3e628b1---8035092504.pdfIn PDF document text
- https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d1f29a8295ce8be29160e97105ef9c9c/zolak.pdfIn PDF document text
- https://advance-pack.com/editor_upload/file/jatuwek.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8eebc35f9---75004945197.pdfIn PDF document text
- http://bociany.sk/media/file/renizilave.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3ef9b20b---puvamewulimakufanef.pdfIn PDF document text
- https://nieruchomoscikomercyjne.co/files/file/nitajanafol.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+bulletproof+diet+cooking+methods+roadmap+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_off0000f569.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF569	11364 bytes
SHA-256: `f7f7f9c3dd4289e2392f94270d48a8e4ab9cac5f40fdeb6ceaaa1d105a37e93c`
`font_01_sfnt_off00010f8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F8B	17752 bytes
SHA-256: `b489cd8f2bb8a97ebbbf7ad72d93e637badcca920636ea75d5607169ee84a5db`
`font_02_sfnt_off00013dd0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DD0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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