PDF malware analysis — malicious · 1fc17abdebfa30f3

MALICIOUS

PDF

84.3 KB Created: 2021-07-08 01:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: b023c02cd2e0c2b01de13a7b31eb790b SHA-1: cdbaf8ba5b64cc50d821964ab12930d4e8353a4f SHA-256: 1fc17abdebfa30f3cfaab054f65839fbe9c73ff3d60d6022eb6c28ecbcdff519

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and link farms, suggesting it's part of a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://krisoc.ru/uplcv?utm_term=how+to+calculate+kd+value PDF link annotation
- https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/beca7dd2b826e4f199b04f9fcf0e3bec/nedemudixotalido.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/17712751036.pdfIn PDF document text
- https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/01635530cc532f7ed29cfb890b4fb19f/wuvepibavukerube.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2e6bb72f004c20a003ab5ae1b6b93f74/44454771277.pdfIn PDF document text
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c557ce0b16b---87583918288.pdfIn PDF document text
- http://gustosandvic.com/ckfinder/userfiles/files/famipusibutufa.pdfIn PDF document text
- http://wallsfamilyreunion.com/clients/876683/File/zowusamiturunafexutofetej.pdfIn PDF document text
- http://thienlongadv.com/upload/files/fowobilusi.pdfIn PDF document text
- https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/bnihq80llcn8pm0csseruoket6/20781095528.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d336e800476---39740103218.pdfIn PDF document text
- http://to-tuong.com/media/ckfinder/files/75489572102.pdfIn PDF document text
- http://akicgiyim.com/userfiles/file/kagisutuxefer.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66a13c614---13937905814.pdfIn PDF document text
- http://aucoindeshalles.com/menu/file/34809254747.pdfIn PDF document text
- https://micast.de/wp-content/plugins/super-forms/uploads/php/files/4ka003dh470gfa353774hqqdi6/godar.pdfIn PDF document text
- https://detectiveoffice.net/userfiles/file/84594579175.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf252b525b---buguvexuxubazonesuroxo.pdfIn PDF document text
- http://sgyscom.com/upload_fck/file/2021-6-30/20210630174551204008.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1goi0l4jb3pm1942gd2kf6nmm1/gekan.pdfIn PDF document text
- http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082823441208---basilivokevatubanofuj.pdfIn PDF document text
- https://maturana.cl/upload/file/vuxibakag.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79d5427c6---9192285285.pdfIn PDF document text
- http://asokmontridental.com/userfiles/file/42351214949.pdfIn PDF document text
- http://kondicionery-ivanteevka.ru/upload_picture/file/lufafixurudofoziv.pdfIn PDF document text
- https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e176cd791eab24b451d43184a0793169/padisusalutokes.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_off0000e79f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE79F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ffb6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFB6	10236 bytes
SHA-256: `0c7d6d4bd7475c8cbe3778266d3a31aa83cbf64f094efc2e8b971226eb39d0ac`
`font_02_sfnt_off000116d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116D7	17248 bytes
SHA-256: `d1dd5a05d74e86cc6786588c0d976e935c2141f1b170ae1cf9d87cc7a14e3eae`

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