PDF malware analysis — malicious · 645e711981713a89

MALICIOUS

PDF

92.6 KB Created: 2021-06-27 14:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: be5e80ba76b36999bf6119e41936bff4 SHA-1: 2783a579597db65ceddf541929d397a4d0c15095 SHA-256: 645e711981713a89b1151f3ae25385fb78e3b651a44bb135bdbc84317a2d9bb8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML detection and a ClamAV signature for a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is unreadable, but the presence of link farms on disposable hosting indicates a likely attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5a778370244c7110da468c68950b096f/2093343154.pdf In PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c29d7fd2fe3f812b1befeda08e60c387/8057868440.pdfIn PDF document text
- https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a998998d3e---difunigenimivos.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85b8269ea---nozutinakinuduletit.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/737a0055c10c235237968ad9a1847a17/56736759513.pdfIn PDF document text
- http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/31231007829.pdfIn PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/o2uptub3dvbv0pili0h72ennbj/94447441047.pdfIn PDF document text
- https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ccaae0beb98a689943747f58dcc1874d/lesaz.pdfIn PDF document text
- https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85b726253---90166105161.pdfIn PDF document text
- http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05ab87b5a1---68361142514.pdfIn PDF document text
- http://fundacionecla.org/resources/original/file/18417484423.pdfIn PDF document text
- http://omatsuri.kr/data/userfiles/files/mozojepafukizat.pdfIn PDF document text
- http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/jomegenuropino.pdfIn PDF document text
- http://laulumaja.fi/ckfinder/userfiles/files/tuguxixajul.pdfIn PDF document text
- http://kowel.com/ckfinder/userfiles/files/1622701621.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097aebf90822---tedevivesoremagurubu.pdfIn PDF document text
- http://kondicionery-ivanteevka.ru/upload_picture/file/sixasogabe.pdfIn PDF document text
- http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46ce692f9---xemode.pdfIn PDF document text
- https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/5uujr3kup09q3cspm5h5n1st2c/26395573800.pdfIn PDF document text
- https://foundryindia.org/userfiles/file/55181308356.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085af8f08a2f---25456257397.pdfIn PDF document text
- http://ltptech.vn/uploads/userfiles/file/gapunubutogixapif.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a473d0ab4ab---liruwoj.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17c539acda---bujesu.pdfIn PDF document text
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd6553d19---pituki.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tensile+strength+of+a+material+is+obtained+by+dividing+the+maximumPDF 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_off000102a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102A1	11288 bytes
SHA-256: `c3e09e9044ca2f042685f23189bd3447f983361c52cb3957b5934e1888bb3368`
`font_01_sfnt_off00011ccf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CCF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000134e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134E1	17976 bytes
SHA-256: `74a2d02adb7dc447212de5d0b0fc440ce504ddc106be297004740165ee1b1761`

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