PDF malware analysis — malicious · 42d9d37a0a91a6ab

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 12:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 8fcd70158e7e45c486e0bd68f9ed9669 SHA-1: ab7699b3fab03a61b369229760aec9fedbb1bb4d SHA-256: 42d9d37a0a91a6abb59ea2e522cbc320843421f59587dab53d09666c1bfab89d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=an%C3%A1lise+sint%C3%A1tica+visual+ernani+pimentel+pdf PDF link annotation
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b5eb9cb134a001210faebe7e2a667048/28576113775.pdfIn PDF document text
- https://cesiedizioni.com/userfiles/file/82395508568.pdfIn PDF document text
- http://www.pilartangguh.com/file/71472727569.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ea3a019caf1b4d056fb37cba0896e4bb/90191324547.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2ivgrrp8gm6as6ls22rk7ejul6/30459471756.pdfIn PDF document text
- http://abwgulfport.com/uploads/files/roxinijoxukowovemajaxede.pdfIn PDF document text
- http://jagatjyotischool.org/jagatjyotischool/userfiles/file/9778778873.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6dc0edc73008c8b3ec82439d5ebbc2e8/zoxojo.pdfIn PDF document text
- http://gwtcs.org/Content/uploads/files/83078775223.pdfIn PDF document text
- https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/motavexijakudar.pdfIn PDF document text
- https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076478719353---68342874452.pdfIn PDF document text
- http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/1088665509.pdfIn PDF document text
- https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/99dd1cf779ee5d55074476180a19615e/85526827249.pdfIn PDF document text
- http://xn--49s538bo8ux8c.net/userfiles/file/98227172657.pdfIn PDF document text
- http://cuatudongsaigon.vn/uploads/files/vojutipumedos.pdfIn PDF document text
- http://iknow.pl/files/file/wikujelavado.pdfIn PDF document text
- http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/21544388313.pdfIn PDF document text
- http://marketherballize.com/ckfinder/userfiles/files/mivuguxeradufazofog.pdfIn PDF document text
- https://sardavetri.it/userfiles/file/vuwipifovupikepuwowufu.pdfIn PDF document text
- http://kpotplace.com/uploads/files/xoledineviva.pdfIn PDF document text
- http://baharev76.ru/userfiles/file/gabudozoruwi.pdfIn PDF document text
- http://issaproject.com/app/views/panel/ckfinder/userfiles/files/19748952931.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4826d0780d---33512288295.pdfIn PDF document text
- http://fratellilongoni.com/userfiles/files/mofif.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_off0000db28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB28	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f33a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF33A	19548 bytes
SHA-256: `dfb3b1770f3b1be243726b3533174cbc28eb96e272dc14883efc93b281f43c83`
`font_02_sfnt_off000122f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122F0	10988 bytes
SHA-256: `c898752619992c7ff99cb243eb9ca05792e3f14a80b543bba69c2be1dfc0266a`

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