PDF malware analysis — malicious · 349662b8522dc8c0

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 05:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 42bb6822b8a7e7c30ba27d31bbd147f7 SHA-1: a29649084ef494ae6a8ca90a85fce4b5deb44fbb SHA-256: 349662b8522dc8c0f8e96e4505eaeae2bf7c2b6b8cc9dc2fd6a7aa13da509422

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://medvor.ru/uplcv?utm_term=computer+output+devices+notes+pdf PDF link annotation
- https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/8143785e3f83b345e121b6bb84610b3a/85825193773.pdfIn PDF document text
- https://lescourailleurs.com/upload/editor/file/buzojalon.pdfIn PDF document text
- http://brmhn.com/userfiles/file/20210803193808_dv9zv8.pdfIn PDF document text
- https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/057f7dfcc39b13d914dbaca94e97b548/mobawibopoxemisibenibove.pdfIn PDF document text
- http://hoangduy.vn/vn/files/80710736141.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ftqslsv1sns3gtcj8gbohu9ka0/sakaxuzafoweburo.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/28vp81d0jrj39s593rjfunk1j4/tuwobedopoxuruta.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d53c84db9---zefawafusoperetogadedel.pdfIn PDF document text
- https://salvatoredivilio.it/userfiles/file/38198282915.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac750cf939---93214067373.pdfIn PDF document text
- https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/5fcc04bef8e4efaa11b838ee665d4940/nusefopakamoniromijixej.pdfIn PDF document text
- http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/78d03imgtph7mrddcahnov9dc4/nedesan.pdfIn PDF document text
- https://dollarplus98.com/images/upload/files/fetexunewovonuwisarus.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9429a2cee2---tapomebasowepipeno.pdfIn PDF document text
- https://stijsr.com/userfiles/file/loxixubozajubujoginepoke.pdfIn PDF document text
- https://olivierdaulte.com/ckfinder/userfiles/files/xorasorebubilane.pdfIn PDF document text
- http://labonscafe.com/userfiles/fekenuremepolevobikide.pdfIn PDF document text
- https://lee-trading.tw/archive/upload/files/55341989270.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/415800ba0723fe0922ef951bf00e9cb8/vojasomifalixaf.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609516d039bc5---lebedosakomozodilosoram.pdfIn PDF document text
- https://activepymes.com/pub/file/zekedalodejokifopix.pdfIn PDF document text
- https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/040713993338a786ee26e01781bea621/72817941645.pdfIn PDF document text
- https://hirurgija.me//files/1574922759.pdfIn PDF document text
- https://alianzatours.com/imagenes/file/mukumosujuvep.pdfIn PDF document text
- http://okfilm.kr/userData/board/file/45786600211.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db2616c9849---5453933498.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_off0000c1c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC1C1	10768 bytes
SHA-256: `5903b297f7cb2281aa59700b7e0103a8d883c3da53b6d99eee65e3b7f80ec41e`
`font_01_sfnt_off0000da8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA8B	15960 bytes
SHA-256: `5e700c475c499548a9d5f41829eaf6524c11d94d03cc0c1943114e11afee1a82`
`font_02_sfnt_off0001039b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1039B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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