PDF malware analysis — malicious · aa7be89fd35c35d6

MALICIOUS

PDF

90.2 KB Created: 2021-06-28 23:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: adc6f4d595b45da965b7a35c76566ef3 SHA-1: 5ac01cb551f69f7021f14fdc12938d2bf3da7520 SHA-256: aa7be89fd35c35d67eaf312d24435dab5d9c0d10c47851783373ef8adc3c351f

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 sites, suggesting an attempt to redirect users to malicious content. The file's structure and embedded URLs indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://laborke.ru/uplcv?utm_term=how+to+know+if+you+fractured+your+skull PDF link annotation
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098ed828c51c---fewowivetufuwib.pdfIn PDF document text
- http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5cc9a076---nopuzonivubasowakemof.pdfIn PDF document text
- https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/rt6ki0jl21kl153k54d8pl91ju/15356078699.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be5ed56768---4241665576.pdfIn PDF document text
- http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/149c8ed06ffc3bb4b7052a9a72b63b56/gaxugofukarikinivumu.pdfIn PDF document text
- https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/ba46a66faaec108b27cdae0d4ae4e11a/moraxonilofesabepikezano.pdfIn PDF document text
- https://xlspandoek.nl/userfiles/file/76826963892.pdfIn PDF document text
- http://ziconiavip.com/uploadfck/file/73244601614.pdfIn PDF document text
- http://brmhn.com/userfiles/file/20210521192417_gcny6f.pdfIn PDF document text
- https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/8aeb41faa2c7bd7072eac37e31864bee/pemajibemulu.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/87c6b681e26985a57d1ce8dc976247f6/55288860730.pdfIn PDF document text
- https://liniagdanskzydowo.pl/files/tolop.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3f54df380fc1d6f86cdd1a4cfd48928e/72939652563.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba4f0a69cc---mefixapori.pdfIn PDF document text
- http://bodegaadrover.com/userfiles//imagenes/78063135392.pdfIn PDF document text
- https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d1bf3a1ccbcceacc4283a67d12cdb75f/6990482400.pdfIn PDF document text
- http://seamacros.com/upload/file/lumazitiponabetuzi.pdfIn PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/s4i118pk03kblj2qc5t0jeqiig/34606596381.pdfIn PDF document text
- http://aep-tc.com/cache/fck_files/file/87649534580.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/10959322771.pdfIn PDF document text
- https://astek-telem.fr/userfiles/file/xuzeliwaxinuju.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0d4e6a8e5---26680652690.pdfIn PDF document text
- https://djennebeads.com/nbloom/fckuploads/file/vuteralavigevowapivokoka.pdfIn PDF document text
- https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f34134c637689c71b50cb8b0ad8e517d/fuvetadozeginiw.pdfIn PDF document text
- https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d65a5835d9---xabelajetular.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a565c169c04---nijevulijozur.pdfIn PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d75ca7cd1637596043d60f30c3d86716/97909853085.pdfIn PDF document text
- https://soliangco.com/contents//files/96989069440.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_off0000fecc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFECC	10852 bytes
SHA-256: `840df71e1414ce2cfd78eb9f6f65713d2de47e585353ccd47eeb976c92cc5654`
`font_01_sfnt_off00011809.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11809	16632 bytes
SHA-256: `15b0067f67310ee0e144457b65c227273da1ae5824706c0648d20dfdf2f098c1`
`font_02_sfnt_off00014341.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14341	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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