PDF malware analysis — malicious · b6a39f7ec61b1ad6

MALICIOUS

PDF

109.6 KB Created: 2021-06-27 02:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 62ab41320dd75dcbc43550508ace8281 SHA-1: 9225d15fffbbe986c6998fd41b496b4daad320d1 SHA-256: b6a39f7ec61b1ad6c951346c29271f19fec76f6774e28ea7831ba229d6b02bb9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious or phishing websites, potentially for credential harvesting or further malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9797

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 http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160719e405a06f---71028309478.pdf In PDF document text
- http://kingtonkatsu.com/uploads/files/43834932603.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb83e4389---tanapije.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849f574b861---87528269950.pdfIn PDF document text
- http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95859391d---wuxolosatalaseroridupo.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7fa403ac6---53964556386.pdfIn PDF document text
- https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/27064f98cf8d7141fc1397d5678140ae/ragujubeta.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45cf7b654c---39153895057.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/fd14d7658d11de17498a0e0212c14711/70969761228.pdfIn PDF document text
- http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fefa1729---tilidovugaxa.pdfIn PDF document text
- https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c733550dddb---93053734974.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/fe2a6a84be474eb3b5fed0c582d9f1ac/45458068789.pdfIn PDF document text
- https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/u2a0k6hgt2jreohuupf1qoa8ou/31490089062.pdfIn PDF document text
- http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4c201c19---55799984228.pdfIn PDF document text
- https://cottonweb.net/userfiles/file/gixadumasenodelezo.pdfIn PDF document text
- http://www.gesas.it/media/mailinglist/file/75879559146.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070e579e3714---30111364109.pdfIn PDF document text
- http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01649937a---90906728341.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a360b73d2de---guzubekemu.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb3faabf6---sunokakomulewadovavanivig.pdfIn PDF document text
- http://kingbikeonline.com/images/upload/File/gowotikipodelebetefudama.pdfIn PDF document text
- http://everest-c.ru/ckfinder/userfiles/files/18035853447.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bae4780f2---gijogitize.pdfIn PDF document text
- https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/lst5sj5be9jr3agkhq0k076u27/tojosutowosol.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74cc0109f---39852090324.pdfIn PDF document text
- http://divorce-difficile.fr/userfiles/file/97076884846.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=chapter+1+chemistry+test+answersPDF 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_off0001477d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1477D	17984 bytes
SHA-256: `704b375faa6b056cfcbad5e23060945cc31d613c59c2ea662a8361b6ae9ea5ac`
`font_01_sfnt_off00017674.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17674	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00018e8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18E8B	10756 bytes
SHA-256: `717b90aa99db7566da2bd30e6c6b47cf363f45fd6931c872da707db09c2d507f`

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