PDF malware analysis — malicious · 7c6b7a58bc86fc3b

MALICIOUS

PDF

90.4 KB Created: 2021-08-30 11:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 56b9281fd375f26ddcd3182f7e6136e9 SHA-1: a0529f54b7e68e23e81cc3c420ad8db04c6e6335 SHA-256: 7c6b7a58bc86fc3b77d6b2dea1a835a977cf56637acfe797f5644576c6de2134

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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 http://brandnewgoods.net/userfiles/file/kajep.pdf In PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26c9cb9ad---revesibimigedekakula.pdfIn PDF document text
- http://abwmechanicsville.com/uploads/files/4629732829.pdfIn PDF document text
- http://alibabashipping.com/userfiles/file/76561520137.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092318ccec6b---xikanoxugub.pdfIn PDF document text
- http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f7a3b7b33---94154425807.pdfIn PDF document text
- http://csc0516.com/userfiles/file/20210704002143_3lg954.pdfIn PDF document text
- https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb74910ba40---ponilojogaju.pdfIn PDF document text
- http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a70af132f36c0087d7971f9005da8a6d/tobumuzepikuvepiwupodu.pdfIn PDF document text
- http://zulassungsservice4you.de/bilder/file/pajuguzewarif.pdfIn PDF document text
- https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/qlvl9h749krkisupnb5dcrebl3/56223074596.pdfIn PDF document text
- https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/u4icqv84eoh0peoocsaaob2p5s/joxavedegeligezife.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/fe5db2206c9aac04814f0be40cb3e0aa/rupikeroduzajan.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d7b273388b045f294f7ba5cb67ca7b72/numolufe.pdfIn PDF document text
- http://avatars.ru/userfiles/file/33305764734.pdfIn PDF document text
- https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0db3054928e44bb96e6b8e97994fabaa/bolilux.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984847b7a7e---vosugoduronesotelemus.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160beb7da4c297---15444612160.pdfIn PDF document text
- https://mchs.kz/userfiles/File/95885856528.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ad4552ce---9734446521.pdfIn PDF document text
- https://autotrans911.com/thread/admin/uploads/file/115199576.pdfIn PDF document text
- http://automyjka.pl/automyjka.pl/userfiles/file/24170635955.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160856fce5ddaa---napoladilovepukatawotale.pdfIn PDF document text
- https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6979c7edf---xefokidek.pdfIn PDF document text
- http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/fhjeejfkle97ccqhu75r9rj103/62029011985.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=he+sound+of+silencePDF 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_off0000f731.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF731	10200 bytes
SHA-256: `cf9171e01ae9a9f84e59953780bfb114ef2434ae44a205aa578b0da83c457b6e`
`font_01_sfnt_off00010e1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E1A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001262c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1262C	20200 bytes
SHA-256: `4e4bfa550fd6082f20955b3f7463d76eb7fb00ce18206e5f8c22239c3a93e8a7`

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