PDF malware analysis — malicious · a31e70ca9cf3ee0b

MALICIOUS

PDF

88.0 KB Created: 2021-06-27 00:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: b79f739dccbae32c3012ae0987053150 SHA-1: cd65394e738b6f27d58de02911a0431c7ae60f87 SHA-256: a31e70ca9cf3ee0b8c262615a4d10736a856420c3de166bbf76ac37e020089cb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload storage, suggesting it is used for phishing or malware distribution. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084062c8377e---dolebemuzakuvixixodozagom.pdf In PDF document text
- http://ibb-online.ru/f/file/jufonalubiwowigegekuwek.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b06ddeafa50---lunojowogudurefi.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/99dbotmq68g0ghvdkdk3cfibg9/lomivedelu.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/662417a7cfd8fa383d2ca59fc9a75089/geduzow.pdfIn PDF document text
- https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/3hv30a3js6s84tcqg94lra7r7f/31811786779.pdfIn PDF document text
- http://aodaibooking.com/FileData/ckfinder/files/20210602_0FE75D7EB1A051CF.pdfIn PDF document text
- http://omak1968.com/clients/71178/File/sasevafototar.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99b8cef571---newugokategozuwigugu.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce68766823a---larosoxidafonul.pdfIn PDF document text
- http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c913663a116---52200817979.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2924675b9bd36e6981e1e402a30ca3f5/duvedazadakufejazaxaki.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9a370f802---koxuwowugago.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e65a97f46---dezafedugeniminebomof.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e0464b2e7---95774826567.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609247c5a0386---gonewofamu.pdfIn PDF document text
- http://madmojo.com/fckupload/file/tejero.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d0520385---77141940921.pdfIn PDF document text
- https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/n2c4avku7afouniknbc4dmjcta/dibibelifelijusazozodaz.pdfIn PDF document text
- https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/4b61832511c968606d00e00a28f54e46/wamokenotodu.pdfIn PDF document text
- http://scheiden-maassluis.nl/uploads//file/89340634553.pdfIn PDF document text
- http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/sibeboj.pdfIn PDF document text
- http://ankurgroups.com/userfiles/file/wedaxenubawejukuxevojifev.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ea3c22e54bd9f44e95b9961ff15dddcb/sogotimujekobemakisam.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ad33edd8ecf7e9d108cfd50cf297841b/miwejujuramasajeboturokub.pdfIn PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b86aab5091f---435136094.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=multiples+of+3+up+to+50PDF link annotation
- 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_off0000f85d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF85D	10504 bytes
SHA-256: `ba6180c6b513012cd499d508add6e5a831ff3d149f86b34389da5f23c5292875`
`font_01_sfnt_off00011074.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11074	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012886.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12886	16336 bytes
SHA-256: `7c8fdca4dd58000ec72e12bd1c67bfedac5cc86354276dd1d1f019d42ec92852`

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