PDF malware analysis — malicious · 8fea07f94c9d8caa

MALICIOUS

PDF

72.0 KB Created: 2021-09-22 21:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 93cc22045ff1434a9b806fea2f6958f1 SHA-1: 6df0e733a33e4c089cac8ab36ad0f3481bd7ff7b SHA-256: 8fea07f94c9d8caaacf7cfd665b8853142f7b3d729a2de892a35ecd188bc0a68

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, likely intended to host malicious content or phishing pages. The PDF structure and embedded URLs suggest it's part of a phishing campaign, potentially delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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://crysiq.ru/uplcv?utm_term=open+source+expense+tracker+android PDF link annotation
- http://gordostcrista.ru/userfiles/file/36831499302.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/70741557987.pdfIn PDF document text
- http://badaranquehablar.com/userfiles/files/tumobelugafefed.pdfIn PDF document text
- http://amsasecretariat.fr/userfiles/file/35503523155.pdfIn PDF document text
- http://zvezda-rostov.ru/ckfinder/userfiles/files/3613300137.pdfIn PDF document text
- https://groupits.cm/uploads/fck/file/20943931525.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeed54d82f---76760304974.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b81191d4c---wozoxuwudi.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16131938ae255d---bekegiwajeg.pdfIn PDF document text
- http://harasim.cz/uploaded/files/widokelefel.pdfIn PDF document text
- https://faresaldabbous.com/uploads/files/80679795948.pdfIn PDF document text
- http://av72-reklama.ru/userfiles/file/163051538342d0f7ee600116ffc6b2.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614900c392219---65545646074.pdfIn PDF document text
- https://gruppopolidori.com/upload/image/file/jewamujoxasawodojijilevov.pdfIn PDF document text
- http://aquamedia.cn/ckfinder/userfiles/files/gifamosepiviroze.pdfIn PDF document text
- https://biocoop.legreniervert.fr/ckfinder/userfiles/files/lirafu.pdfIn PDF document text
- http://gr-chem.com/upload/files/85368251132.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8079e307b990db2f80bed86b6667f25a/luduvadimawok.pdfIn PDF document text
- http://allier-genealogie.org/File:/rozub.pdfIn PDF document text
- https://kolbandibileklik.com/resimler/files/91552953085.pdfIn PDF document text
- https://villadelauca.com/userfiles/file/4083302100.pdfIn PDF document text
- http://bfr-bialapodlaska.pl/userfiles/file/xewuxapazefuviroxamizo.pdfIn PDF document text
- http://net-marketing.hu/images/files/53774268933.pdfIn PDF document text
- https://florerialafloresta.com/ckfinder/userfiles/files/81899031732.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_off0000b823.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB823	16120 bytes
SHA-256: `6dd3f37106ad578bd1b1a6dabbeffe72752bc2a885b5fed9593daef540f15e78`
`font_01_sfnt_off0000e14d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE14D	10780 bytes
SHA-256: `edfb8006190475eeb3770a178f363988933661fb038507719aa07738330bf41a`
`font_02_sfnt_off0000fa52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA52	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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