PDF malware analysis — malicious · a159f46dae29ccdd

MALICIOUS

PDF

93.5 KB Created: 2021-06-30 17:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 1398989a6fc3c9b4d0e6afea42b90572 SHA-1: 003f33c11e82481755982185bb68ddd358507b14 SHA-256: a159f46dae29ccdd8ad6cf039adb9d65fcc90b3b2b17c44f9d8c7304966406f2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

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 and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9935

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://philabc.ru/uplcv?utm_term=professional+commercial+cleaning PDF link annotation
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb66019b1b---1822337245.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a440da2ea9e---femevoxorofomibol.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad354da65d3---sevirev.pdfIn PDF document text
- https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7be6b9174e6b1d052e9e009c5d6488eb/rapuvejusakelasarikejit.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/14526023906.pdfIn PDF document text
- https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5607264bbd5e4af66326ec6c24fc45b4/lavudiwoluboberadef.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae574fdd5---pitaxoj.pdfIn PDF document text
- http://interel-rus.ru/test/sites/default/files/file/96985851512.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e42f917bce16990d6b8868f00939707b/32949498637.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0b495abb9---lugebudakajadojepup.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928e457309c---lijadituvaxofuxagoxe.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d741d93ba---40212720692.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a89d02b33b8---64809227573.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d02fb10f27d---belofilikofis.pdfIn PDF document text
- https://stpeterscbs.ca/ckfinder/userfiles/files/pezedutodujogeguluxagiped.pdfIn PDF document text
- http://blissworldbeauty.com/newerac2c/userfiles/file/texizerizavuzubof.pdfIn PDF document text
- https://akrmedia.no/ckfinder/userfiles/files/48491836673.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb594f223b---ronafaxojizit.pdfIn PDF document text
- https://pk-kuepfer.ch/ckfinder/userfiles/files/4444775408.pdfIn PDF document text
- http://epsilonsigorta.com/files/watigo.pdfIn PDF document text
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d08062044---puzip.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adef6d59de---zofemesu.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4b85b4f03786198815e4e3afa7f89cc9/xopavib.pdfIn PDF document text
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46dd29095---degeb.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_off00010adf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ADF	17380 bytes
SHA-256: `6bd2abf5188de91b750c386e02d6fd81995fa0cf4a45a11cffbe5968fa6f9945`
`font_01_sfnt_off0001387b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1387B	10580 bytes
SHA-256: `8333efb5bebbad126c8fcb0b378d414c884e39a80e7ef11e12696a4cb3a81e8d`
`font_02_sfnt_off00015098.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15098	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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