PDF malware analysis — malicious · 6dc612babb860fce

MALICIOUS

PDF

89.9 KB Created: 2021-06-30 06:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17

MD5: c95d388fcdb63e97fab01a4bddcd203f SHA-1: f4bc21a86846fd766d2cfcc7195ececb60a66100 SHA-256: 6dc612babb860fceab88523a48b57b1aa08732021815eb2af01cccdaa4874404

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests this document is part of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://synerhu.ru/uplcv?utm_term=the+definition+of+inappropriate PDF link annotation
- http://pospatrans.cz/UserFiles/File/2094084097.pdfIn PDF document text
- https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d6ea568085aad3b3eb66c20e77c12737/zawokuberomolejikabixa.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608763899291d---livenizijodukotujexo.pdfIn PDF document text
- http://alnoorcity.com/userfiles/file/498955679.pdfIn PDF document text
- https://tavio.ru/files/file/govapesosuwadetugazud.pdfIn PDF document text
- http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7f3b5fcfc9e8e765ede9b7d4fe202695/dofododowus.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef2ca54548---sujefejopojukuwufodi.pdfIn PDF document text
- http://asustainable.com/global/file/wigomezibij.pdfIn PDF document text
- http://beijingbeat.com/contents//files/68531465587.pdfIn PDF document text
- http://mppscstudy.com/admin/usercontent/file/84218870184.pdfIn PDF document text
- http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cea821fafb---60703615875.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255d8e36f4---vowedaximoruwuduta.pdfIn PDF document text
- https://mmszke.hu/files/file/7535412238.pdfIn PDF document text
- http://goldartline.ua/userfiles/file/36868912790.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-5-28/20210528162946698653.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/lunoxavipesusimoduki.pdfIn PDF document text
- http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d18e889c1---90064634849.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9d765daf922dd52067dfe5f0566a4a58/47756799425.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608900e6ea1d7---7224898703.pdfIn PDF document text
- https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/76fe1499dc6fb4218e1b71e2ba30495c/97521127729.pdfIn PDF document text
- http://sport-way.ru/img/file/pazegar.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a0e8a98e9---nakoregadozirax.pdfIn PDF document text
- http://www.lugashotel.com/data/editorfile/9048921909.pdfIn PDF document text
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f43cc8829cce51499604cdd7dcf8459d/nisuju.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e113.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE113	18920 bytes
SHA-256: `daa24dfa23df7760c15e4c252761a9d8793db7da430f85c51cb5d1347a27f7ed`
`font_01_sfnt_off000113b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113B8	16060 bytes
SHA-256: `8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825`
`font_02_sfnt_off000128cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128CB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000140e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x140E2	10344 bytes
SHA-256: `58eaec73375badfcfe86fdf2428f8db83564ec0d567ae06e872be74e8cdd7c6e`

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