PDF malware analysis — malicious · 16f7b1dd0e0a17ee

MALICIOUS

PDF

72.0 KB Created: 2021-06-28 23:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: c5e9c8853d558a2695813fcb7fd4c844 SHA-1: 7dbfbd20c35fc1553039501c76394585960186b9 SHA-256: 16f7b1dd0e0a17ee880a52a18ecce973531284f943933a19ba912b30aa400d3e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, many using 'utm_term' parameters, suggests an attempt to drive traffic for malicious purposes, such as phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=taxonomy+worksheet+answers PDF link annotation
- http://russkiivopros.com/images/FCKeditor/file/42783392331.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/84f8cf0684217c442bf10964e9b58db9/3328858832.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608163865af0f---pekovesopinebi.pdfIn PDF document text
- http://ipceurope.eu/assets/file/22673619150.pdfIn PDF document text
- https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/c9cb85hgg9i2201p29no5kdeg7/94747115378.pdfIn PDF document text
- https://alshamiltrading.com/alshamilfiles/file/jifukasutobewuw.pdfIn PDF document text
- http://ptairsupply.com/userfiles/file/fozujutele.pdfIn PDF document text
- https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfdcaacaa2---bosolusekixifi.pdfIn PDF document text
- https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d0e08b24c192db0193ef8d183ff6d983/pigojuligotoso.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f673c1e671---lorulezekoxinus.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a7a7bdc23---lesitikabigibimu.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e46e2044---sojakonilizemipikula.pdfIn PDF document text
- http://birnagarcollege.in/userfiles/file/99716445925.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a4edca4d1---76633107327.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ee9145a31---64363788220.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a2128ecdf---5781612646.pdfIn PDF document text
- https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609841602317b---57942449125.pdfIn PDF document text
- https://jodhpurtravels.com/nbloom/fckuploads/file/mipajulapawekamuwex.pdfIn PDF document text
- https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/oam1od2cm1bo3b8631lfbst5dn/14345961243.pdfIn PDF document text
- http://abacusnancy.com/userfiles/file/2984210745.pdfIn PDF document text
- http://beloezoloto.ru/userfiles/file/ridexamepijokuxisalaliji.pdfIn PDF document text
- https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/5a99d5529be059c63b25476f0027d08a/57898799464.pdfIn PDF document text
- https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/09cac158225e7c3a4848403b350d030e/xiraf.pdfIn PDF document text
- https://hazeloyun.com/calisma2/files/uploads/45135670310.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_off0000b8dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB8DD	16232 bytes
SHA-256: `2f49e83e1701544453094233adbb40a7d0eeee4fa094b37bcc496b0f62302245`
`font_01_sfnt_off0000e2c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2C5	10592 bytes
SHA-256: `29facb3ad81a7ea828902e8ece5b5ed4cec7bfa717b321c104b3718e2a43d852`
`font_02_sfnt_off0000faec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAEC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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