PDF malware analysis — malicious · 13dd27fbc670bec4

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 03:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 65e325098b4bbb379a60f73c116cfb7d SHA-1: 959cbf6570cc2f32abe1adc9a3a5146b1bf9ebfc SHA-256: 13dd27fbc670bec43cd8cce92a8e4efcc88d7e52ca3f5a81d8aeea830ffc4117

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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://queure.ru/uplcv?utm_term=how+to+use+manual+clutch+motorcycle PDF link annotation
- http://bankerz.in/qpic/files/nidogobijuvositujekidugep.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609838ca5c662---67459883600.pdfIn PDF document text
- https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/05b417a2b39abd0bbb0415807ef4fc54/12434377420.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/kmodj18a1p56obopistcr1hr8e/radibilavugi.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a471887ff20---8387191781.pdfIn PDF document text
- https://akproauto.com/nbloom/fckuploads/file/76335251545.pdfIn PDF document text
- http://bong-dem-long.org/upload/editor/files/safimuli.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16105302426d29---xozinifafosa.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8bc13f911---90089381058.pdfIn PDF document text
- https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160862bfe32efb---17777126016.pdfIn PDF document text
- http://chipublichouse.com/ckfinder/userfiles/files/97765977457.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925202d4df6---16871276379.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc3e6193d7---2542843838.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098318f626cc---goban.pdfIn PDF document text
- http://webinaris.net/ckfinder/userfiles/publics/files/29856200064.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2218acf23---9578371049.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160fc553cbbd84---runijutogoza.pdfIn PDF document text
- http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce857b6ee24---navesafagom.pdfIn PDF document text
- http://abpaluso.com/upload/file/86700832073.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e4385d10511---pelaxozugigubut.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c520c9b642d---dudowabogovilil.pdfIn PDF document text
- http://accessibilite-salle-eau.com/ckfinder/userfiles/files/boraxova.pdfIn PDF document text
- https://sunarchegypt.com/userfiles/file/12852584581.pdfIn PDF document text
- https://scavilecis.it/userfiles/file/88270827241.pdfIn PDF document text
- https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/k5f1a9d6kl6fpi7hdh2cs8jelg/lugevilojegevaxitopi.pdfIn PDF document text
- http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/494c80cbabbe4ed18fdb22a8e2fa30a2/6863081196.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_off0000dbcd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBCD	10692 bytes
SHA-256: `b2f1cb7def23d92c3558eca5044ac9063186b50ceb9bcc4a8f7c0642d1e11992`
`font_01_sfnt_off0000f43a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF43A	16304 bytes
SHA-256: `b408a75602d980bd31aa13741bd8cca87a90b8502d29f8aef463369532d295ed`
`font_02_sfnt_off00011e5a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E5A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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