PDF malware analysis — malicious · 29fdadfb8d56f144

MALICIOUS

PDF

98.2 KB Created: 2021-07-31 07:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 5d7933052f80d41c51a1985651b0fed5 SHA-1: 9951ee355844c3699691f84940440257dab09d4a SHA-256: 29fdadfb8d56f144569bd53699459c9b87303727704b2a1ff07ce96a3b3e56a6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. The presence of numerous links, including those pointing to WordPress upload directories, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=what+popular+foods+contain+gluten PDF link annotation
- http://agro-pasz.pl/ckfinder/userfiles/files/5656721743.pdfIn PDF document text
- http://consol.hu/images/uploadedimages/file/48707054859.pdfIn PDF document text
- https://pacie.vn/web/uploads/files/85726542273.pdfIn PDF document text
- https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fd38f0ae2---jojibovanino.pdfIn PDF document text
- http://moreit.ch/productinfo/file/7123013242.pdfIn PDF document text
- http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/jukiziwosajez.pdfIn PDF document text
- http://mcutech.net/upload/2021/07/file/1625173273903173517.pdfIn PDF document text
- https://beautydiction.com/ckfinder/userfiles/files/bunemapusika.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a25de66f---lidifudosoxozifibixepaz.pdfIn PDF document text
- https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160784bbb693c4---lukupesefomefejeximibafa.pdfIn PDF document text
- https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/nsat5f38iumh4ct8ed1mocdlm8/23338775276.pdfIn PDF document text
- http://elfuklid.cz/foto/Image/file/7713098072.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8005d6957c---fefiwapatowaxalolebar.pdfIn PDF document text
- http://elitvorota.ru/f/file/2847452594.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda4378ed9---59728497727.pdfIn PDF document text
- http://learnersdigest.org/userfiles/file/tatejovok.pdfIn PDF document text
- https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe66f3be43---wojomidasezozotig.pdfIn PDF document text
- https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd21dcb1e---nimelinolobevan.pdfIn PDF document text
- http://mashtalkandil.com/userfiles/file/kobiri.pdfIn PDF document text
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609413240126d---wavikikakekefof.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rvms6dluuohb7mc5oga51567ba/masusebaluzegexode.pdfIn PDF document text
- https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5be90ae3c---tukutogamamegepodiso.pdfIn PDF document text
- http://www.mueblesgamez.com/ckfinder/userfiles/files/xerizigenomud.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4fdc355c0---20700861700.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_008_off00015a8f.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x15A8F	18540 bytes
SHA-256: `9086cdf842f461d438795c08bdec393969e91cc858a6c082862de88f8cda03d6`
`font_00_sfnt_off0000fd47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD47	10992 bytes
SHA-256: `c987381da833937b0e832013b05bc93b4a29ffbb4ef7381bd6830af92fbe5c31`
`font_01_sfnt_off00011693.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11693	16920 bytes
SHA-256: `a4031510251806385d3c985c06179dfbf8bd987f4934b6a90b29010eeefb82d5`
`font_02_sfnt_off0001427e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1427E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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