PDF malware analysis — malicious · c37e9b2f6fa34674

MALICIOUS

PDF

67.8 KB Created: 2021-09-16 19:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 429e09ade14d835b73f89f6986978ec6 SHA-1: 81aa27e2d4ae350498c359928964ba360d00ec99 SHA-256: c37e9b2f6fa3467405e4e881d745d9848d4ee76e85b964018448f765642b1b7b

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document's structure, being image-heavy with minimal text, further supports its use as a deceptive lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

Heuristics 7

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE

PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
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://wastran.ru/uplcv?utm_term=dna+mrna+amino+acid PDF link annotation
- http://studionegro.net/userfiles/files/12566315041.pdfIn PDF document text
- https://minlinart.com/archive/upload/files/fisovifetejajeripamudi.pdfIn PDF document text
- https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f9b3b62a2---bajefem.pdfIn PDF document text
- http://frankifoto.com/uploads/pages/files/zejotarogudarowolesak.pdfIn PDF document text
- https://beldapin.com/calisma2/files/uploads/47854686518.pdfIn PDF document text
- https://alkathirilaw.com/userfiles/files/jikiwidatev.pdfIn PDF document text
- http://magiepourenfants.com/images/mediamanager/file/23079214898.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613f3bacca190---ravejaso.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89bb3cfe5---4937064119.pdfIn PDF document text
- http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/97560691210.pdfIn PDF document text
- http://ceresasrl.it/userfiles/files/98684525480.pdfIn PDF document text
- https://md-bud.pl/szklo/photos/file/tujoboserebuvonid.pdfIn PDF document text
- https://ndmoyun.com/calisma2/files/uploads/jujijosevovomumif.pdfIn PDF document text
- https://kaowei.tw/image/files/20210905_071710.pdfIn PDF document text
- http://eugensa.lt/app/webroot/uploads/userfiles/files/zodav.pdfIn PDF document text
- https://jyapa.com/jhuoyue/uploadfiles/72293672484.pdfIn PDF document text
- http://medicamarsala.it/userfiles/files/wileroxumemiforizo.pdfIn PDF document text
- http://christopherspubandgrille.com/userfiles/files/57143717503.pdfIn PDF document text
- http://cimkezes.hu/uploads/ckfinder/userfiles/files/3918064756.pdfIn PDF document text
- http://goodwill.pl/userfiles/file/9312482936.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341738a6597---pagedematalokomojubufagix.pdfIn PDF document text
- http://around-sicily.net/userfiles/file/46712765088.pdfIn PDF document text
- http://huarui-bio.com/upload/files/2366433360.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_off0000b185.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB185	13824 bytes
SHA-256: `0b9505687c06017bd43750d40db3b95525d7548a0eaeefbd5f8973b4b91ad008`
`font_01_sfnt_off0000d360.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD360	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000eb77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB77	10088 bytes
SHA-256: `df2f5ec55fd18973d130d17617b69d75cfffc72ff6a51ff41c0072ed327e189c`

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