PDF malware analysis — malicious · 3cfdf844b4822e32

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 15:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: a9d49d2129ebb233e5b13b61fa415e9f SHA-1: dd507622ed0d81382424012b1b3def70ed100599 SHA-256: 3cfdf844b4822e3231a2d8ac2665eac7e92d418f43b40a1c8c863919a78e131c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites and other disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point towards a phishing or credential harvesting campaign.

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://cructi.ru/uplcv?utm_term=smooth+chocolate+icing PDF link annotation
- http://bargiel.com.pl/ckfinder/userfiles/files/86549578457.pdfIn PDF document text
- https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/80qidm4kjruo266hsf0cor76hp/nopokosevubidekivuribux.pdfIn PDF document text
- https://rgcsmt.org/ckfinder/userfiles/files/10600673479.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c5c665ff6---nalaxevujenipizuran.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e2832c49---kewezeno.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d0a4823ca---69743168935.pdfIn PDF document text
- http://alnadaoil.com/userfiles/file/mejojobi.pdfIn PDF document text
- https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b5e58343b---88403291449.pdfIn PDF document text
- https://vrindaindia.com/php/joseph/uploads/file/ziromonifogamudew.pdfIn PDF document text
- https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/cb22a922ce18590b5876e21d514fdbd9/63695411555.pdfIn PDF document text
- https://raiporjai.com/piceditor/file/julavuvi.pdfIn PDF document text
- https://lod.la/images/news/file/fexawurime.pdfIn PDF document text
- http://samnakthodrahassob.com/userfiles/file/20770032951.pdfIn PDF document text
- http://artetendasud.it/userfiles/files/sojopofamikilef.pdfIn PDF document text
- https://lanjutpt1.com/contents//files/wazavowudobu.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/87d7ad4d412fffe7d4563a0ddac7c4be/35696106309.pdfIn PDF document text
- http://kmkonsult.cz/userfiles/file/54962502327.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d636cc934e873da1bdd1d2d25933c812/razizubefeb.pdfIn PDF document text
- http://itineraire-consulting.com/ckfinder/userfiles/files/zurifobivimuxemuj.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5495cc540---pedafowepuseruk.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/389f5333490e41477a37e45b452d6c04/winasopikagizakisisol.pdfIn PDF document text
- http://www.gpe-el.pro/ckfinder/userfiles/files/futokumabokubope.pdfIn PDF document text
- https://air-separation-supplier.com/d/files/risoxusokuxuju.pdfIn PDF document text
- http://cokhisah.com/webroot/img/files/jegukor.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_off0000df98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF98	18364 bytes
SHA-256: `55005c6c59c12a9fbe271582af282d80fee1b5e5dc326514be60b1edbeeb0789`
`font_01_sfnt_off00010ff8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FF8	10484 bytes
SHA-256: `221085acdbc97e6ea4453d81030784a39e73608760e5c807c1a463d641fd07ca`
`font_02_sfnt_off0001279a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1279A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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