PDF malware analysis — malicious · 3311170aa18f4fe0

MALICIOUS

PDF

78.2 KB Created: 2021-07-06 14:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 2119c04a8b085f5e46ab124fc293d1ac SHA-1: 87cddc3ad563ab3290a8424e8c3bfe97aa93d252 SHA-256: 3311170aa18f4fe045dd03ee3832997e29c919a74fd3134ac699ea4f1f154a17

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=latex+equation+to+word+online PDF link annotation
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rdrfcdt05pusvrusfn00i6ttbi/30307135051.pdfIn PDF document text
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c871c4dca08---bebabinetevatumuwine.pdfIn PDF document text
- http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/72767047281.pdfIn PDF document text
- http://vorne-sitzen.eu/pcms/content/file/52275717400.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/07e0b7cca01689b61e1063143091d79b/pomade.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088671ada726---43626265363.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4a9484b3a---banufanoderunuga.pdfIn PDF document text
- http://alhouti.com/userfiles/file/89230372144.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e6b1ef58a---80370408495.pdfIn PDF document text
- https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/5a7fc8b34061ef84e4b05a6073316147/gubuzumo.pdfIn PDF document text
- https://candbco.com/ckfinder/userfiles/files/xavavusudadasibamevajal.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae84ba74788---59572082158.pdfIn PDF document text
- http://slesnick.net/userfiles/files/85525462701.pdfIn PDF document text
- http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727732a1764---40364812408.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5fa77aaf2a6a87fa361c69658a4ec4aa/93916866062.pdfIn PDF document text
- https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/5994156a978a203717a34c7343f540a5/3496934436.pdfIn PDF document text
- http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/61a62183f77055ee21cb0cab41a937b7/17378017989.pdfIn PDF document text
- http://yummyschool.com/_UploadFile/Images/file/tobifalisexurivewidi.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90536a2cac---43874017701.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4e6245815---wufitebimekimowozoki.pdfIn PDF document text
- https://pasarantogelsatu.com/contents//files/pedada.pdfIn PDF document text
- https://alianzatours.com/imagenes/file/xujikerolamabu.pdfIn PDF document text
- https://x-software.cz/data/file/80711711516.pdfIn PDF document text
- https://pergamine.com/ckfinder/userfiles/files/seramakine.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_off0000cba7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBA7	10464 bytes
SHA-256: `756021d16a37e43323898f8ed03b4fcf67df028917d011aa206e8d9a65608f2f`
`font_01_sfnt_off0000e358.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE358	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fb6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB6A	18184 bytes
SHA-256: `74d0d27ed3dff65f76dd53c68680af30bfaf49d52d5aaff78f76bc486568c086`

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