PDF malware analysis — malicious · c0d471801af2a12f

MALICIOUS

PDF

84.4 KB Created: 2021-07-07 12:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 174aa2c4b7a5b28bbb3e95eab914bd07 SHA-1: 7df6c83ac3c8a44cbfe88637bb3f8dfb23e3864c SHA-256: c0d471801af2a12ff3a330b3161b54ae0d3687766bac906d125d1be67fdf19f8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a Trojan point to a high likelihood of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d525fe6113---86908124655.pdf In PDF document text
- http://eurekaelearning.com/upload/news/file/14529256513.pdfIn PDF document text
- https://anukulagrotech.com/userfiles/file/5462113776.pdfIn PDF document text
- https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/fa2e5729d7b6949b61e8b0a879439396/zajom.pdfIn PDF document text
- http://www.huntsvillepr.com/files/files/dikisimowuxalevunesu.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dafbab623---xukegekorokugutudezidusi.pdfIn PDF document text
- http://chataphan.com/file_media/file_image/file/60389086552.pdfIn PDF document text
- https://valubil.com/public/uploads/cms_file/cms_files/23339288983.pdfIn PDF document text
- https://tungqibiotech.com/upfiles/editor/files/42323606027.pdfIn PDF document text
- http://ecohost.ru/pics/images/file/gazoxeravuwerafa.pdfIn PDF document text
- https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/6caa9f3f173e44d33fc04cfe235685e3/64621978282.pdfIn PDF document text
- https://agrimal.pl/userfiles/file/rakan.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836e85f14b---23237168357.pdfIn PDF document text
- https://ceral.pl/ceral/pliki/file/jelad.pdfIn PDF document text
- https://cihangirhotel.com/upload/ckfinder/files/xagoramedirufo.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30cab564a3---59042558884.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/15cf0b463781646f19def13a031d32c2/zojawawusiwedusovedep.pdfIn PDF document text
- https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1329016bc---56350294678.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d48939953---3085808804.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a36d8ca1cb---37613369340.pdfIn PDF document text
- http://ya-ke.cn/admin/upload/detiwox.pdfIn PDF document text
- https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2c4b567814f618298f5ca07fa75ac7a3/pojogezovidu.pdfIn PDF document text
- https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/7g5ud3g5ok0hna0s48k42epm7n/39830185114.pdfIn PDF document text
- https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/355fbecea81933678b21898a7db38363/7685445628.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dca+to+bufPDF 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_off0000d460.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD460	17080 bytes
SHA-256: `550fb5d86c767e7c5ec07fe2f24a45e04494e71c68972fd5c8e3ef41f78d8bc1`
`font_01_sfnt_off000100e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100E4	16076 bytes
SHA-256: `0491ab1f9781984131449868ed95f15036bddabad70a51597ae233fa8bdf08d0`
`font_02_sfnt_off0001160b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1160B	9928 bytes
SHA-256: `b91aeb7ab24ca89bb0aa8d64d55781842b9ca2e32709a67227b0dd4abd911cdc`
`font_03_sfnt_off00012c2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C2A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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