PDF malware analysis — malicious · 16dba4f15be68239

MALICIOUS

PDF

85.3 KB Created: 2021-09-22 19:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b997e75d2d59a0bdbb609ef2da9f4916 SHA-1: 9898f14e8046c2d474d11d60585167d3776e1b1f SHA-256: 16dba4f15be682397c8a83c4b1e9f3da37b23ca872b63912555754da5bc2f541

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to potentially compromised websites. The document body is heavily obfuscated, but the presence of external URIs and link farm indicators suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is used to host numerous links designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://crysiq.ru/uplcv?utm_term=gifgab+for+android PDF link annotation
- http://srilakshmienterprises.net/uploads/melusurigesupitufeweso.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16133972025f50---64824620986.pdfIn PDF document text
- http://rent2day.ca/ci2/userfiles/files/fixilerisofavidogapevame.pdfIn PDF document text
- http://nhakhoauytinhaiphong.com/upload/files/zidemidexas.pdfIn PDF document text
- https://motecx.com/images/file/19861520014.pdfIn PDF document text
- http://saconsultancy.com/userfiles/file/80392180653.pdfIn PDF document text
- https://driftwoodcc.com/userfiles/files/dakonudibifazijenokuv.pdfIn PDF document text
- http://alexdisinfestazioni.com/userfiles/files/5198349125.pdfIn PDF document text
- http://sity-luxe.ru/userfiles/file/bafuwitewuvedesogasuwel.pdfIn PDF document text
- https://nurdagihaber.com/resimler/files/3019196198.pdfIn PDF document text
- http://grotech.in/userfiles/file/subixukoloxofaj.pdfIn PDF document text
- http://ebrinteractive.com/userfiles/file/xososudoxonexaxugiko.pdfIn PDF document text
- http://vina2002.com/uploads/files/75786475459.pdfIn PDF document text
- http://cx-gl.hu/images/files/9194742681.pdfIn PDF document text
- http://omeofest.eu/userfiles/files/balika.pdfIn PDF document text
- http://gsprojekt.eu/userfiles/files/tuparob.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1351cac73---6274800688.pdfIn PDF document text
- http://issaproject.com/app/views/panel/ckfinder/userfiles/files/95183996835.pdfIn PDF document text
- http://oasis-inwaste.asia/files/file/rilixuwiwapadakoj.pdfIn PDF document text
- https://pima-alarms.rs/slicice/file/32264291585.pdfIn PDF document text
- http://faurerom.com/userfiles/file/27261579913.pdfIn PDF document text
- http://saraiaser.nl/userfiles/file/pabixivug.pdfIn PDF document text
- https://makenie.com/upload/files/28116104190.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe0df937b7---doredisowokusinu.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_off0000ea9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA9A	10264 bytes
SHA-256: `f81a5e7254de2682252beff4ec681e0f6c9da9594d92df9fad5a7d282fc602aa`
`font_01_sfnt_off0001018a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1018A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001199c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1199C	17600 bytes
SHA-256: `7ca91e1b5c275423209ddf4fd6c9417afbdfab30418cd8b7e11df81033d2890d`

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