PDF malware analysis — malicious · bc55946a7f11e0ef

MALICIOUS

PDF

90.6 KB Created: 2021-07-09 00:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 1c0a3159e676432e6f5d639a8418de6d SHA-1: 37e3262d7a187020eeaea5b338cadb572abb927a SHA-256: bc55946a7f11e0efe5f354bf7f022ce8e4a8df8609dc8f78de515a7ac52eda34

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to lure users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this attack pattern.

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 http://chatfieldfarms101.com/userimages/12673024352.pdf In PDF document text
- http://mega-gold.com/userfiles/files/besexi.pdfIn PDF document text
- http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c66dba25e---92964116711.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfece2d6794---zijanaledowudajutetid.pdfIn PDF document text
- https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d02a14aadf---meganuwepefivasaxizokot.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5c4119503545d729c4aa9306cfdd8ef1/dovofuxamexoselewuxegav.pdfIn PDF document text
- http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791ce7d1220---53759514837.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ad196cd67d002aace86a9a8ba6a836ec/nonenirewewu.pdfIn PDF document text
- http://j-club.eu/userfiles/file/33296014290.pdfIn PDF document text
- http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/pusubijuzilazujutudo.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e023567ea---lobanuvaxus.pdfIn PDF document text
- https://marlin-aquarium.ru/ckfinder/userfiles/files/dilakovenored.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094721a9a67f---57127320333.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/vixep.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925052706b---2983415226.pdfIn PDF document text
- https://slezanie.eu/userfiles/file/10238452813.pdfIn PDF document text
- https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/7qubknt5j27vkv9r5pef46ovq5/44230810240.pdfIn PDF document text
- https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16085a9092794e---jigej.pdfIn PDF document text
- http://www.hussco-steel.com/husscofiles/files/tavekinunewetanapubonuf.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e80e89b38---1656501379.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608012cc742e7---13935466546.pdfIn PDF document text
- http://atut-biuro.com/uploaded/file/98202356373.pdfIn PDF document text
- https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/c288ad428b43e230635c76ca451177ee/58318771148.pdfIn PDF document text
- http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/wulemi.pdfIn PDF document text
- http://nousgarage.com/userfiles/file/3775861165.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=my+computer+ate+my+homework+poem+questions+and+answers+pdfPDF 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_off0000fd4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD4C	11372 bytes
SHA-256: `c04287118fea15ba441517f8694fb7dae9938075e6df4c6f30716f10179940e8`
`font_01_sfnt_off000117ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117CA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012fdc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FDC	17188 bytes
SHA-256: `eee626c3e626e544aea2a833b21030787cc44c53322d8e2ecc95dce3f4701551`

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