PDF malware analysis — malicious · 9836bb5b763b5a41

MALICIOUS

PDF

83.6 KB Created: 2021-06-29 19:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 4d8cab137afa8be5edf87f5baa173df0 SHA-1: bd5908c1b6c2d9f1fc5f2c684c35790a8f21c50f SHA-256: 9836bb5b763b5a4102915f48afa6615e0844f30b6040f84567407bac91ddd983

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9923

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 http://shinies.ru/img/lib/file/5982519197.pdf In PDF document text
- https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/60e0aad040854cebf505a9f795dd6a7b/nonazepanuriwopulisarem.pdfIn PDF document text
- https://yuss.it/file/77075945715.pdfIn PDF document text
- https://abe-rdc.com/userfiles/file/nesafis.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c116442fcbc---ramujumomitirekupil.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e6d7b402c---kuvaxo.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbba16ef37---39166043343.pdfIn PDF document text
- http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/6lj5ipcrm9bje4e428pchtesb1/lebugewavuzumiwu.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/igpa8peq4k277jr5hmtuonkvt6/58785335491.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c66b436bd1f0b1be4076283311c33f17/82455574328.pdfIn PDF document text
- https://grancom.by/upload/docs/nanuripuzotak.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ogkntat8n556cv5cjir44jiie3/98002563850.pdfIn PDF document text
- http://bizbecho.com/pa/trainstation/uploads/image/file/luxekebonimisakuwe.pdfIn PDF document text
- http://amuseonline.com/absite/userfiles/file/xisusozoj.pdfIn PDF document text
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/128c1df669b4acbaa569b58ac0c1ecc2/7164605231.pdfIn PDF document text
- http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94a195edaa---15059142384.pdfIn PDF document text
- https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/259jur2l8g6grv892ij8okuvrd/95537463937.pdfIn PDF document text
- https://atphp.ch/userfiles/file/besazuzaloj.pdfIn PDF document text
- https://pirkitpadangas.lt/ckfinder/userfiles/files/sodawapusazetuvul.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/62ab8f83875e351845281f686b3da7e2/22567856914.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e36017bee---zabisisamudulavevel.pdfIn PDF document text
- https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/14daf8b94029f79f0071e5fced8874c6/tewisedan.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84568cdb3---xoraj.pdfIn PDF document text
- http://smeclassof1987reunion.com/clients/37165/File/gawemidaxekubotuga.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=which+one+would+you+choosePDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c8ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8FF	10400 bytes
SHA-256: `38bdf28b276cf2314cdef679542cc3ecee74c97bc34171e7818481cd74ef5eb3`
`font_01_sfnt_off0000e07d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE07D	17548 bytes
SHA-256: `dc91ad6f0f01bb5ae66bc926b08f310a185c181a7795ac69023f7374ee6c8812`
`font_02_sfnt_off00010c89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C89	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001249a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1249A	18280 bytes
SHA-256: `2d473f92dc58669751595fb9d38d01859f3b3a93dfb676b0bc5039cf5c20ece4`

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