PDF malware analysis — malicious · 37fc2d2433258478

MALICIOUS

PDF

89.2 KB Created: 2021-08-03 15:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: 06a0f73119e7e7cdf5be8814f402a133 SHA-1: 222643bbb1314ea381651df43d638a318e5a1a93 SHA-256: 37fc2d2433258478e54330d1b89dbd950b259ad496b12047d99123aced2470e1

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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 http://iccj.jp/images/uploads/fckeditor/file/neduxi.pdf In PDF document text
- http://vasvaripalmuzeum.hu/upload/file/jiguwiwifinozekinekaxalov.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fm5pbv7feqdi5khee9j3fsbol6/1546746566.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161006b8dbb66b---81024107961.pdfIn PDF document text
- http://davidlbrooks.com/clients/868292/File/rupepanazutiwada.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3hq3cnl5rdluo0rekelnft4e12/87357395025.pdfIn PDF document text
- http://mfcwestenkwartier.nl/beta/userfiles/file/5814341770.pdfIn PDF document text
- http://domplus.su/userfiles/files/gugavifukivodifuxebin.pdfIn PDF document text
- https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a28481af8f4---65775554904.pdfIn PDF document text
- https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gfo2em74kdebsk7ddchqnal3h1/36038160385.pdfIn PDF document text
- https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/5004e25ac77643eb05db340b91028673/tawosatelifinajepipafu.pdfIn PDF document text
- http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108066f02886---59964221161.pdfIn PDF document text
- https://pharma-tools.eu/galeria/file/6207078989.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e20b127fbe---41893690804.pdfIn PDF document text
- http://keystoparadise.com/userfiles/files/68548897770.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8abfcfcaec2e82ad28362bc5a570dda8/16357032727.pdfIn PDF document text
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a2b830d62---fipowobazotusuzinemuxub.pdfIn PDF document text
- https://infoenergie-loire.org/userfiles/file/jixiju.pdfIn PDF document text
- http://biancoacolori.it/userfiles/files/xidikolafiwasare.pdfIn PDF document text
- http://mishelik.ru/userfiles/file/kusozegotudosowepinexu.pdfIn PDF document text
- http://a2itsolutions.com/chop/multimedia/userfiles/file/43742327256.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9aad21e7c---97190782893.pdfIn PDF document text
- https://pmms-online.com/assets/file/fufasasilefibinabi.pdfIn PDF document text
- https://dubaimotorcycletours.com/uploaded_images/files/gedakobalexivikesukeref.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+do+an+incident+reportPDF link annotation
- 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_off0000fa95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA95	10372 bytes
SHA-256: `9842601b1717eeb38b3a58e202f37f1d07656c5ed6aa5806e0e962fb2da2847f`
`font_01_sfnt_off0001121b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1121B	17108 bytes
SHA-256: `e6431da5b340301426755875c3b3bd65bbc7b4dc8949573bd4bd47e580d290e0`
`font_02_sfnt_off00013ef1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13EF1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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