PDF malware analysis — malicious · 7b2db9c9bfd72be4

MALICIOUS

PDF

78.1 KB Created: 2021-08-18 00:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 3413f7a7fbba4ecf0dfc2c5e476c2410 SHA-1: 4e1245df660554043d0dc7fe2cef63f3a0ef6ccb SHA-256: 7b2db9c9bfd72be47fdbd445d561801a6510399e7ec5152a2cb71624b53bd28f

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 a phishing trojan. The file contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=ispad+dka+guidelines+2017+pdf PDF link annotation
- http://masterref.ru/editorfiles/file/42155646447.pdfIn PDF document text
- http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/m9ungcs0oggq569sqvbtjufeo2/73107538218.pdfIn PDF document text
- http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/89720129950.pdfIn PDF document text
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8876f1e057f79ade597b27d9bdf08300/gojup.pdfIn PDF document text
- https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/o31loh2jl8q7mj9ke9jj0ji472/womewufuripe.pdfIn PDF document text
- http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4a46660a---saxakalaporuwigutixiwizom.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45e6966459---64647311398.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b45aa30aa.pdfIn PDF document text
- https://nhachoxebus.com/upload/fck/file/57531349579.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/479597a9e5d8e6d7bcf9c54ee3ae1acf/6909761881.pdfIn PDF document text
- http://thementalhealthadvocates.org/files/userfiles/file/daditarijiwokidekewasagu.pdfIn PDF document text
- https://cochleartudaskozpont.hu/files/silogisagegezesewofek.pdfIn PDF document text
- http://emmanuelmissionarybaptist.com/clients/74938/File/53552021484.pdfIn PDF document text
- https://i3mit.com/shopadmin/upload/files/19036804659.pdfIn PDF document text
- http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/botoxanet.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076ea5d512d5---dewuxalavudifa.pdfIn PDF document text
- https://topclassgardening.nl/images/file/12360860052.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607290fb3f83d---jufowugidufadux.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0fada3b16250fd1ae09a2f138e218456/91364781917.pdfIn PDF document text
- http://3e-machinery.ru/app/webroot/filesfiles/23225089938.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a84a99ae4e1aebc053ba331d23c97d0f/46589329445.pdfIn PDF document text
- http://veraschwemmle.de/fckdata/file/xudegit.pdfIn PDF document text
- https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/10b7bcb488a61db77e6cb8a5fffe3dd0/83024065725.pdfIn PDF document text
- https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/90400fe3c1a704721784baf43a122660/15497927677.pdfIn PDF document text
- http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160abe77ad1392---23531930771.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_off0000d066.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD066	10840 bytes
SHA-256: `24479d086d68b1d2d6638981d4c691edb3ccd9194ad5b1c5801cbd788cf2db68`
`font_01_sfnt_off0000e96d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE96D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001017f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1017F	15512 bytes
SHA-256: `b338d3874475e5670d9211d4f0b3c6bd8c1a1b2884c91998ea8bd7f31c3065cb`

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