PDF malware analysis — malicious · 8d6aad58ecbe22a0

MALICIOUS

PDF

89.8 KB Created: 2021-09-04 10:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 0726221c4a8f226c625a2bb46f811cc5 SHA-1: 07d26493d5d4001f1d2653be2c758ebcab4248aa SHA-256: 8d6aad58ecbe22a0167c4dd2673480137365a6d1e89589aa77eaa15eceedbd17

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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=nucleolus+structure+pdf PDF link annotation
- https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/cc12af120e85077ec6f8ecb206ed2e9b/vopazuvutexazi.pdfIn PDF document text
- http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771d94ab1f5---76519180085.pdfIn PDF document text
- https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7924ce8a1---45517872788.pdfIn PDF document text
- http://vaness-sens.fr/ckfinder/userfiles/files/11864906982.pdfIn PDF document text
- https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/04c25a2d80fe94632931c741479a1e69/pobir.pdfIn PDF document text
- https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c58215045514050436d8b9f863b1411c/gidodagupoginepetimaxe.pdfIn PDF document text
- http://liweisteel.co.th/ckfinder/userfiles/files/59224696071.pdfIn PDF document text
- https://taichielite.com/louis/taichi/ckfinder/userfiles/files/26393000159.pdfIn PDF document text
- http://archgeo-leszno.pl/uploads/userfiles/files/80135583937.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609421d5ee715---bagidijokoxasemom.pdfIn PDF document text
- https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/lvc0i216uskohebj07n42b57vj/toveluzovexaropeju.pdfIn PDF document text
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/96565a86e9ced2e7b1bde8fa26435135/66855159652.pdfIn PDF document text
- https://marljivo.hr/UserFiles/files/56458488540.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be3d5d42c15---5569208165.pdfIn PDF document text
- http://gramercy-grand.ru/files/file/lipibuvukarevizalibek.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1l9fe3bc4prdna0j5idvg8d32u/ronipiwipuxudif.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f6ce4ae1832e918514f8e1bddaee90d4/komip.pdfIn PDF document text
- http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb774e2d87---malarafanokebitukima.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6a52adadd---sukajotidisovutav.pdfIn PDF document text
- http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a64686a4fb6---28664870842.pdfIn PDF document text
- http://inannamsao.com/uploads/files/50998983853.pdfIn PDF document text
- http://kusadasidentalclinic.com/img/userfiles/files/54952416098.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f539d42f02---10403077784.pdfIn PDF document text
- https://clubforeducation.com/FCKeditor/userfiles/file/24445900643.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27d8c1430---nopidategumo.pdfIn PDF document text
- https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/tt3qbgkq1vbvmc02s5kjh254sr/54874985165.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_off0000fc71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC71	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011488.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11488	10332 bytes
SHA-256: `eb015ae507b115136ee4dd0cc2b5eb79dad2e96a15d64140c012391f87a017b4`
`font_02_sfnt_off00012c07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C07	17820 bytes
SHA-256: `36edbd1684977309ad7e166ef39e54314f9ee910cc5c903879fa385d1c393a9f`

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