PDF malware analysis — malicious · 57fd6caf1d659a07

MALICIOUS

PDF

104.7 KB Created: 2021-07-18 05:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 4e5cbd34835c39c21f70f8fd4ee168ef SHA-1: a7c88403c486f2c3bbde25720061d7db1837705c SHA-256: 57fd6caf1d659a07191b65482ebcfed0ee1c2cdc1cab8f6156777e85f289b008

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

Nyx PDF Classifier malicious score 0.9737

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/92dbbe32ee7cf89950aef73778f41bfc/89536417899.pdf In PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d64db69b725---4928154760.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252aaf4bf---75839948036.pdfIn PDF document text
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700777d153d---90980842908.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6add44763---18039834057.pdfIn PDF document text
- https://yocarbroker.com/upload/ckfinder/files/11172786219.pdfIn PDF document text
- http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b1fb4cb8---xumevuxaboxiloniriwo.pdfIn PDF document text
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/34132815b9d86b39ebf521e39cd5038b/muriji.pdfIn PDF document text
- http://dianacb.cz/userfiles/file/37555140658.pdfIn PDF document text
- http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/16465211697.pdfIn PDF document text
- http://gardatrans.com/content/Files/vabudowegomabodemakela.pdfIn PDF document text
- https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/4e0faeb4e9faba1d14bf85cf25b40fb0/5125788140.pdfIn PDF document text
- http://agataklimowska.pl/userfiles/file/85848893486.pdfIn PDF document text
- http://gorisum.net/fckeditor/upload_file/file/gojelulitomanuvapinaxid.pdfIn PDF document text
- http://winfielddeli.com/ckfinder/userfiles/files/korisixezelan.pdfIn PDF document text
- http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9f5eceae3bc6a7c4ad66cadbb3548e9f/45888281202.pdfIn PDF document text
- http://prplus4u.com/ckupload/files/vowakizemulixumuvurak.pdfIn PDF document text
- http://qunjl.com/userfiles/files/nerexipu.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h7e59rgucbj0t80io6656v71g2/fowevewexiredu.pdfIn PDF document text
- http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/surupasojatanogikoko.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c08dd88fb---biwinamadeva.pdfIn PDF document text
- https://liffeyartefacts.com/fckimagefile/file/3415013206.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b196eb3e17---pupofopukofudizaduzufifi.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=meaning+of+guessworkPDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off0001250c.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1250C	29624 bytes
SHA-256: `e50466ee07832a16c190b9bca760e51cdb4a22efa6f7885273d283d95ce18a7b`
`font_00_sfnt_off0000eeb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEB5	21464 bytes
SHA-256: `a9d7bc3997e4049ff258ba81f0dea3520f15379e7c2a0a6de00d61734aeedd5d`
`font_02_sfnt_off0001592c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1592C	10516 bytes
SHA-256: `fcd63aff047fec896871974edb2731219e7ecab530c70a0772d73fc38a09c999`
`font_03_sfnt_off00017154.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17154	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_04_sfnt_off00018961.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18961	2744 bytes
SHA-256: `b34d372e6266575bc7d2b385fa97c2b9ab5316e67430777f67f6787578c8710c`

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