PDF malware analysis — malicious · 42d11949793964ec

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 22:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c7e0f81b58798a4f3e9a9f9f25a624b1 SHA-1: e1d9499f1ab47d1074302ed5a5fa7cbcc581a707 SHA-256: 42d11949793964ecd5e3b2e08b6a2df7817b4ffff7fdaab1640ba2349da0168d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, but the presence of external URI heuristics and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=initiation+short+story+pdf PDF link annotation
- http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c1f665707---4987566230.pdfIn PDF document text
- http://phunphu.com/userfiles/file/26416253654.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f6ffeaf4e20b7ccf1514d3c10e952f42/13343455215.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f9737ac5---sogozedefokudeme.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c769ee51ddb0c3b6616828cc5e9f0a40/gatuzabozuw.pdfIn PDF document text
- https://eric-parnes.com/ckfinder/userfiles/files/90113161736.pdfIn PDF document text
- http://www.euro-fly.eu/userfiles/files/92247317774.pdfIn PDF document text
- http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16125f936b2d6f---48377193514.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608711db10cd4---61771904796.pdfIn PDF document text
- http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0kvq1a4qhvmr9up96uamfu0cds/dijibovavap.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/a2jcobvtkd80m5qnl97k8kaisv/13622447582.pdfIn PDF document text
- http://duhochmis.com/files/uploaded/files/47075938386.pdfIn PDF document text
- http://alde-pace.org/ckfinder/userfiles/files/kokolazipefadidukunu.pdfIn PDF document text
- https://lawweb.info/mycms/admin/userfiles/file/dimuvonotexubapizajut.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc2ac96a89---poruzewa.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a5ecf2c8276e22b2bf8aea0a9871e958/64573489320.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73bc3f0ba8---zugapalawipojo.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a89pleavqmk124ed57qts53uu1/robufesikoxobetezomafavo.pdfIn PDF document text
- http://obchodsezlatem.cz/upload/files/xuratanom.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160798bf728607---87681341754.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2042e20826b2a14b672dfdb4cd71ef8c/gikaxatevetetana.pdfIn PDF document text
- http://spreewaldatelier.de/img/editor/file/nebidizowulava.pdfIn PDF document text
- http://stacjaregeneracja.pl/userfiles/file/44304317558.pdfIn PDF document text
- http://beachfirebrands.com/userfiles/file/neduvewuvepilizonogovuwaw.pdfIn PDF document text
- https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/486a202a4a07ff6fe82ad21b3c539064/85580933507.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_off0000eb5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB5B	10480 bytes
SHA-256: `15d68a938a262f4439a30094cfda98e869e57c20300cd6d650f120bd9664040b`
`font_01_sfnt_off0001031c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1031C	19644 bytes
SHA-256: `b625400007ba9a7ace3826640a6b78ac4e5cfb85e8a4b779b26d4ccefcf6e248`
`font_02_sfnt_off000134ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134AE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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