PDF malware analysis — malicious · c1a033afb42354c4

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 17:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 07bce8fca8cc0a21ef25453705bde0e6 SHA-1: e89be0fbd7196f8da0fb02ae8fdbc058e3e2c24f SHA-256: c1a033afb42354c40605d0ce8a08cc00de6c983e6c7fe2b51860694931e2efb7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and link farm indicators strongly points towards a phishing or malware distribution attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=how+to+save+data+in+sd+card PDF link annotation
- http://goodtraefarm.com/ckupload/files/berisuwipifukaremeziluj.pdfIn PDF document text
- http://brandnewgoods.net/userfiles/file/79888219155.pdfIn PDF document text
- https://tezerwatch.com/file/upload/files/09-08-13-23-39-82.pdfIn PDF document text
- http://ettorebelfioreliutaio.it/userfiles/files/zojupaburatosezuvigag.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb34f31820---43176271747.pdfIn PDF document text
- http://hatdesechia.com/storage/ckfinder/files/32759099865.pdfIn PDF document text
- http://gizmakina.com/depo/sayfaresim/file/30881785790.pdfIn PDF document text
- http://www.centralperdana.com/file/kerunasije.pdfIn PDF document text
- https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/0e85e44f6996ee26f557b7e8a4afe69b/49280335671.pdfIn PDF document text
- http://hk-bbc.com/upload/file/ligikakelabunidajifanufu.pdfIn PDF document text
- http://medi-sen.com/files/files/kixub.pdfIn PDF document text
- http://parvazyab.net/basefile/api203/files/19157562213.pdfIn PDF document text
- https://ww150005.linebot.net/upfile/files/20210907230401.pdfIn PDF document text
- http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316a6cdefec---todazerexaf.pdfIn PDF document text
- http://jinruily.com/UploadFile/file/20210901124312893.pdfIn PDF document text
- http://urs-certification.com/gais/image/file/wukofovadepesizebesageto.pdfIn PDF document text
- https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/rufidawogovenavevamox.pdfIn PDF document text
- https://privatecambodiatour.com/userfiles/file/62632230342.pdfIn PDF document text
- http://zovsh.com/Uploadfiles/files/15034500148.pdfIn PDF document text
- http://babijie.com/upload_fck/file/2021-9-11/20210911043611416520.pdfIn PDF document text
- https://tuinvandecruys.be/file/gemuge.pdfIn PDF document text
- https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/dk883gpuqi7ad9tgsuitg894fq/lepufinomowixeme.pdfIn PDF document text
- http://asv-solnice.cz/_files/file/44651435351.pdfIn PDF document text
- http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18771338044.pdfIn PDF document text
- http://kossuthdigisuli.hu/userfiles/file/letavemilefosuxukuz.pdfIn PDF document text
- https://living-stone.lu/userfiles/files/xarafuwowilobelij.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_off0000d1fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1FB	17380 bytes
SHA-256: `8ac909db5a9a2c883187d8c311eb2d19d6d8f3230d434700fe7e1fbcb4adfe8e`
`font_01_sfnt_off0000fec0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEC0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000116d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116D7	10460 bytes
SHA-256: `66e307fbe436527962e8eb892390baa426a24ee0d7d421973918f16fd40badcf`

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