PDF malware analysis — malicious · 73b79a545aa6e56e

MALICIOUS

PDF

71.8 KB Created: 2021-09-02 00:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 27999e97fcdd14e43c892051599155e1 SHA-1: a385891d5546bcd13986f8ffac2dae713b08ade3 SHA-256: 73b79a545aa6e56e4c505c6d7e7ed5c610217a22d0719f84092f8f3ab96a4dc9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=meg+griffin+in+real+life', are likely used to distribute phishing content or further malware stages.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=meg+griffin+in+real+life PDF link annotation
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ada3ce9d86be3106df7f77b95353a4cd/38206272876.pdfIn PDF document text
- http://esejsc.com/upload/files/sadobug.pdfIn PDF document text
- http://bbmeti.it/userfiles/files/motote.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b70233d0f---bojijew.pdfIn PDF document text
- https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d505a6af4904ee1c3cea4ecd9a478d06/paxiwubizimaw.pdfIn PDF document text
- http://aksaaydinlatma.com/img/editor/image/file/45435862147.pdfIn PDF document text
- https://uangraja.com/contents/files/44839508614.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ir9jha0bdj254rfsktdc9vm3k2/17868251246.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf105bba5---livuni.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4da4737c7---bejoxumajivani.pdfIn PDF document text
- https://avenue102.com/uploads/file/44951651011.pdfIn PDF document text
- http://bebelino.ru/userfiles/file/leselonakipo.pdfIn PDF document text
- http://pphu-joanna.pl/fckpliki/file/7388521056.pdfIn PDF document text
- https://cafesca.org/ckfinder/userfiles/files/fusopesemujudopofumaxoga.pdfIn PDF document text
- http://openendrep.com/userfiles/files/batuxabatizajub.pdfIn PDF document text
- https://fallsplat.se/file/65254152567.pdfIn PDF document text
- http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/c01i9jl8jfo4mhkngtu46g7fq0/75694716645.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ebe45d316---61249009452.pdfIn PDF document text
- http://logisticsnetworks.net/ckfinder/userfiles/files/lobejavewopujomeb.pdfIn PDF document text
- http://fygl.net/uploads/file/220012166673.pdfIn PDF document text
- http://edmo-cars.nl/images/file/6345086000.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/fb06371e064adcb976c21d4929d02758/16103792223.pdfIn PDF document text
- https://osikovo.eu/webroot/img/content/files/6459066437.pdfIn PDF document text
- http://foodzipo.com/uploads/userfiles/files/lururogifegiminonum.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_off0000ba20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA20	9996 bytes
SHA-256: `d8ebcaec3c3b391bcf9d2dce75c49fe7da8fb00cad0fe3c1f147f8dae48ac151`
`font_01_sfnt_off0000d05a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD05A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e86c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE86C	15980 bytes
SHA-256: `b4bab35b2ed96f0d86ee106d7ea8a6bd9ae0695bd8627bd837734869ee24e862`

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