PDF malware analysis — malicious · e41920ac722c0680

MALICIOUS

PDF

108.3 KB Created: 2021-07-01 18:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: c641d979e0bbc114cc4d5bab98ae2417 SHA-1: f8ec5463498091d33b2c3b2996dfbf5464c418bf SHA-256: e41920ac722c068049bf40bc38bca6bfa3feda94ed1d6811db86e733eccd81a7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9921

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=game+design+character+development PDF link annotation
- http://train-in-japan.com/images/blog//file/womufariwatogogaw.pdfIn PDF document text
- https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/65c06bd3ae1d9faf1fd5753c228c3e6d/jozuto.pdfIn PDF document text
- https://ispartaorganizasyon.com/ckfinder/upload/files/76101757482.pdfIn PDF document text
- https://himalayanwanderer.com/himalayan/userfiles/files/40141400730.pdfIn PDF document text
- https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/68vrjgol9om4kr1rfcltgd60oc/46158546825.pdfIn PDF document text
- https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9bc4f0d56---16741358524.pdfIn PDF document text
- https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5a0edf0038f6d865fcd78d1861dc3dc8/tozarozofewifer.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b4396579381---wavujorojosurodixunixod.pdfIn PDF document text
- http://gustosandvic.com/ckfinder/userfiles/files/pimam.pdfIn PDF document text
- http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/24813383238.pdfIn PDF document text
- http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c91ea598f19fd07ce5428ba521372a9f/mevafikuli.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b78b7445---93483001440.pdfIn PDF document text
- http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vdnm9e52kkdtovtfk20inndhfb/gizelaxadevakepikotu.pdfIn PDF document text
- https://cristalparkhotel.com/ckfinder/userfiles/files/teninuzepegakisemazo.pdfIn PDF document text
- http://championsview.net/userimages/49413211740.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/dabipobere.pdfIn PDF document text
- http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097061610e32---20916550643.pdfIn PDF document text
- http://cgl.lu/userfiles/files/48821414232.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/oubo59qu005rrmlftl1iil5ir7/nigagabonaki.pdfIn PDF document text
- http://przychodnia-felinskiego.pl/uploads/editor/file/jisirirozoladinivopusil.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/r748ut8eem6ott28qv1mmav7h7/65448702594.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed87f66830---10085517988.pdfIn PDF document text
- https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/83aac69e720c171ded3137d739bfd892/30631132113.pdfIn PDF document text
- https://esprimagroup.com/userfiles/file/bozokapol.pdfIn PDF document text
- http://igigeothermal.jp/userfiles/file/17407792836.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_off0001444f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1444F	16980 bytes
SHA-256: `f51a1b51cad68d080cde2eb032d4354da09657b2067d3c9e4ccea08de3843937`
`font_01_sfnt_off00017095.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17095	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000188ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x188AC	11064 bytes
SHA-256: `e25384abbfeab557b23babf6bc824f1c23d93a251d779e7ead7378b5a2cbd940`

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