PDF malware analysis — malicious · b71fc4e3b2f291c1

MALICIOUS

PDF

83.8 KB Created: 2021-08-16 08:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 0d403fbe536330052f6f1a421eb2c9b9 SHA-1: 8bdf39cd24d1cf84491cf187fdc3036fafccfa11 SHA-256: b71fc4e3b2f291c1fa2a05c8d5813b7751431dbefa06a9ba98253282e9384b43

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to lead users to malicious sites. ClamAV detected this file as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to lure users to phishing or malware-hosting sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=roux+method+3x3+pdf PDF link annotation
- https://global-brand.net/userfiles/files/vurirew.pdfIn PDF document text
- http://dentalclinicbangalore.com/uploads/pezuvikupozotisun.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2dec73d0876a055819f72a22f238cc04/69148955486.pdfIn PDF document text
- https://allmassage.net/upload/file/20210621191501.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb2ed2d1e---89047618152.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/u692or4bs4v7q63llc32dued8u/vesotafewawulazikiresel.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/10b6b8e138a9541b7c49cecaeda58c2e/8643607097.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5faea332bb---garegizopoxi.pdfIn PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a9b27d79---rutet.pdfIn PDF document text
- http://schokozentrale.de/idata/zogunivowuzev.pdfIn PDF document text
- http://busankid.com/webfiles/board/file///96830613294.pdfIn PDF document text
- https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c30da8f1267---78036473434.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7146bc7e4---fedopuzu.pdfIn PDF document text
- https://numberonerevolution.it/file/kifugaponebeborejanib.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/bvltg35ipt4smk50h1kr5s1s43/4447667326.pdfIn PDF document text
- https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e95af3ee7fb53df9173562a44f3d1ef1/19394012746.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f37381d335b---fudademorozixobud.pdfIn PDF document text
- http://beerskiboot.com/img/upload/file/21379325776.pdfIn PDF document text
- http://kudusde.org/resimler/files/30245156480.pdfIn PDF document text
- https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/16523047812.pdfIn PDF document text
- http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e55d196f8f---3834440516.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/s0o7luj4a3u828if2irqd4iv7d/2576752692.pdfIn PDF document text
- http://kirilmazbardak.com/userfiles/file/fokasulosezaxu.pdfIn PDF document text
- https://butagallery.com/userfiles/files/wojekevivatilin.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fce0a77318---koxofugewizevosisip.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_off0000e072.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE072	10512 bytes
SHA-256: `979ece755467414d71ff8c858f7d155c4429267df247a89760dfb187bdffc35a`
`font_01_sfnt_off0000f875.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF875	19332 bytes
SHA-256: `7eae5f8e31abe458cdab4a58ef5abea0f92168ddd1c1f00c07acf793b425c0be`
`font_02_sfnt_off000129cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129CD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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