PDF malware analysis — malicious · e8f2075345b35a10

MALICIOUS

PDF

86.0 KB Created: 2021-08-23 14:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 4411934ec92848870566c66fadb6bc35 SHA-1: ed8d071b3bf2a12a42a5b8f3355480894d3cb754 SHA-256: e8f2075345b35a1084dd07fbf274f4f0c4f3d83178c5ac1c2ae3fde04463b42e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves leveraging these external links to redirect victims.

Machine Learning

Nyx PDF Classifier malicious score 0.9903

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://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d1137d19f15e5153b8fc46fddbbd2d95/rexefonujezulipofafaror.pdf In PDF document text
- http://kramnyca.info/img/upload/editor/file/sugonefoxuledijisu.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f5f42bb1275547d4cedccaa382cbb6d9/guwevubepodesalojakelu.pdfIn PDF document text
- http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16123720b3a292---bowunokefipari.pdfIn PDF document text
- http://alliance-ic.ru/uploads/file/14563924843.pdfIn PDF document text
- http://ttworld.hu/uploads/content_files/files/25189470504.pdfIn PDF document text
- https://kingdomdatesuae.com/userfiles/files/17366476417.pdfIn PDF document text
- http://hayatteknoloji.com/webimage/file/pivunepej.pdfIn PDF document text
- https://gastriklandsbf.se/UserFiles/files/wajizafugaxini.pdfIn PDF document text
- https://cheeselicious.net/UserFiles/file/fatekuponutamubitizuponej.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bff1357ed---56355220126.pdfIn PDF document text
- http://aczelzalog.hu/tmp/limugiwowejedowum.pdfIn PDF document text
- http://iscyber.com/userfiles/files/wasemuwizefa.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba03cdb3afb---lopesajudogedet.pdfIn PDF document text
- http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f770cd00e95---sifete.pdfIn PDF document text
- https://feldmann.pl/userfiles/file/9799931785.pdfIn PDF document text
- http://ugrctrani.it/userfiles/files/gemejagerokudu.pdfIn PDF document text
- http://elisa5888.com/shopadmin/upload/files/26185894048.pdfIn PDF document text
- https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/09f77a7122c2cc6cc86db6b7a038f2ef/dabibukujifozegazuwarefa.pdfIn PDF document text
- https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/q0r892sr1f60grti8at6bbp1b5/kirasulibibof.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160805a9fedb64---20272521823.pdfIn PDF document text
- http://www.autoservis-hubatka.cz/admin/upload/ww/file/xugapisofepaziwudonukuzi.pdfIn PDF document text
- http://bobiniauto.com/userfiles/file/73424491941.pdfIn PDF document text
- http://tpokebar.com/uploads/files/fuwikezamiwatut.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/299846043ae771a52ebda331b3122b65/50470918238.pdfIn PDF document text
- http://albertopizzetti.it/userfiles/files/16597090697.pdfIn PDF document text
- https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099c04962c8a---vukelakimafazep.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=about+cathode+and+anodePDF 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_off0000ed83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED83	10280 bytes
SHA-256: `4c9888c9539241ce59d50b56c802407b2197f690c7a3922a9c48674c65d9493e`
`font_01_sfnt_off0001049c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1049C	16964 bytes
SHA-256: `06babb01298b39fd563928f02d22612d4eeb11ede037fd19a98deffc98ea9f36`
`font_02_sfnt_off000130ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130EF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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