PDF malware analysis — malicious · 78d8d719b09da35d

MALICIOUS

PDF

87.1 KB Created: 2021-09-18 15:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: a2c0a78dc6a4773ec5c65a8df8b5b1be SHA-1: 7b0e59d8c82605c81fde17550ea58a63055213c0 SHA-256: 78d8d719b09da35d49290831a101f4c57b0cd4c804257c09487cf628fa23d4b3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role as a link farm for malicious purposes.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=picsart+2018+version PDF link annotation
- https://dadesigning.com/daduserfiles/files/44079817063.pdfIn PDF document text
- http://neodentpetrosino.it/userfiles/files/kipinalobimoxojuzajuma.pdfIn PDF document text
- http://geofer.eu/userfiles/files/3526059514.pdfIn PDF document text
- http://lasfyy.com/uploadfile/file/20210905075338659.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327ebd4be4c---28654086178.pdfIn PDF document text
- http://hoilhpnqbthanh.com/upload/file/5739669323.pdfIn PDF document text
- https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161368ee58a05f---10834884927.pdfIn PDF document text
- http://expertsystemgroup.com/file_media/file_image/file/tufeduv.pdfIn PDF document text
- https://searchlink.org/userfiles/file/10018853361.pdfIn PDF document text
- https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/fjgdk87r5sqo7d70tlpbd633f0/kopudilizatedulitawo.pdfIn PDF document text
- https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/belubodejudupizunorupanuv.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/70704906102.pdfIn PDF document text
- http://theexplorerthai.com/userfiles/files/vekotala.pdfIn PDF document text
- https://evpersoneli.net/ev-personeli/file/22452120777.pdfIn PDF document text
- http://asiavent.com/UserFiles/file///39671128527.pdfIn PDF document text
- https://igraonica.me/userfiles/file/46648617050.pdfIn PDF document text
- http://kolbiko.com/images/uploads/file/86876627607.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b81a11e63---zotivasajoxa.pdfIn PDF document text
- http://samnakthodrahassob.com/userfiles/file/78963774945.pdfIn PDF document text
- https://tainandentist.com/uploads/files/202109061917058333.pdfIn PDF document text
- http://excitechem.com/userfiles/file/wafola.pdfIn PDF document text
- http://ingfrimale.com/userfiles/files/27131573411.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161429ea3743a0---58426364184.pdfIn PDF document text
- https://curewelldiabetes.com/userfiles/file/nuvuzewokesuwekafaxuwuduj.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_off0000f115.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF115	17236 bytes
SHA-256: `454d01fb021974a4de401f4578d976f7b5dcec9cd6da76f48697f90248df368d`
`font_01_sfnt_off00011de1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DE1	10744 bytes
SHA-256: `167607c14fcac2c6c8f17b73e2fa6ccade78496a5fe59cc154c636c74de3b6bc`
`font_02_sfnt_off000136e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136E1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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