PDF malware analysis — malicious · aa5a983250181bc7

MALICIOUS

PDF

89.6 KB Created: 2021-09-08 00:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: d34f97c901cb6f1db881905bc37448e3 SHA-1: 0f79984494f53135bf5c20938a91d103aba12c28 SHA-256: aa5a983250181bc72ceac15b24c1726c9e1b71e7fe3995ec7eca80f3e73dbbbd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains multiple external URIs pointing to compromised websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using link farms on potentially compromised hosting to redirect users. While no scripts were explicitly extracted, the nature of PDF malware often involves JavaScript for exploitation or redirection, hence T1059.007 is included.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://crewmak.ru/uplcv?utm_term=the+manhattan+project+book+pdf PDF link annotation
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/e6ec9372238361b5b6d0a4f1c4422c14/zorefekasosusutetajid.pdfIn PDF document text
- http://prosquash.by/data/sunojosenepagijevozof.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160723015719f4---9058329467.pdfIn PDF document text
- http://vervesimuhub.com/userfiles/file/85674053327.pdfIn PDF document text
- http://mprime.net/ckfinder/userfiles/files/53771324612.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/53cc3af90c41865179d34472f301347c/5708150551.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d9e492d365b0aa16397873641d320e30/wadamawedofozuduvofedaraz.pdfIn PDF document text
- http://thuonghieutoancau.vn/uploads/files/66163435893.pdfIn PDF document text
- http://ippon.lv/uploads/File/bumiduk.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac499383b70---50236411713.pdfIn PDF document text
- http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ac5e3c08---kenegolitupisara.pdfIn PDF document text
- http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/80933570405.pdfIn PDF document text
- http://vytvarnyobchod.cz/UserFiles/File/5659413726.pdfIn PDF document text
- http://imcborivali.org/userfiles/file/tazifuvazegilopolumupi.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8eba959e4---mufepororatagovowuma.pdfIn PDF document text
- http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jufekuduxobax.pdfIn PDF document text
- http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e2b8a67e1---78668484503.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d83860af535---lakonovugozipidowa.pdfIn PDF document text
- http://abwfinlay.com/uploads/files/27650418077.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0a85636866c452e2d3ced1ff08d28010/33887695727.pdfIn PDF document text
- http://master-sign.ru/ckfinder/userfiles/files/texodunenijuxogeg.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b8e024e0---97964515051.pdfIn PDF document text
- http://thomasbelldescendants.com/clients/40432/File/57763588812.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/cf467e095925e37b5fb144622c30c048/33158809521.pdfIn PDF document text
- http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/e6f985da6af0fa057cb45cc35b638a66/8707433786.pdfIn PDF document text
- http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/bedezotekeko.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_off0000f8d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8D0	18160 bytes
SHA-256: `8c2858debb114670f07bbf277f7c4d1bfa8ee2c6f18f626d4c34e2e1399e3173`
`font_01_sfnt_off00012830.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12830	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014047.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14047	10904 bytes
SHA-256: `afd2440ae679ef23560142c0e574a16920b3f6be10c6b48c826b4da69547ac21`

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