PDF malware analysis — malicious · a11d213d3eea25ce

MALICIOUS

PDF

74.5 KB Created: 2021-09-17 01:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 93b72f1c6001e066254220b50b28604a SHA-1: 3ef4b10c280d31dd03c31e81380c99d37d75da64 SHA-256: a11d213d3eea25cecf61342aa1aef146d94e4be7392a3d7c5b08540a0458053c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of numerous embedded URLs and the nature of the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143b53699bd3---37935409187.pdf In PDF document text
- https://essuances.com/ckfinder/userfiles/files/42301990942.pdfIn PDF document text
- https://bisleri.genefied.co/ckfinder/userfiles/files/80901569334.pdfIn PDF document text
- https://kingwaterpure.com/ckfinder/userfiles/files/85673297914.pdfIn PDF document text
- https://singlespeed-switzerland.ch/userfiles/files/23745164266.pdfIn PDF document text
- http://www.cda.org.hk/ckfinder/userfiles/files/23804399180.pdfIn PDF document text
- http://ascensionchina.com/userfiles/file/81786388018.pdfIn PDF document text
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d26949cfe---xepadirogemonidozamozux.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca818f7d0---55932590312.pdfIn PDF document text
- http://satthachkhe.vn/image/file/65598910760.pdfIn PDF document text
- http://www.prieteniitehnicii.ro/documente/file/3399413567.pdfIn PDF document text
- http://jarosi.hu/files/file/54256645309.pdfIn PDF document text
- https://vetregistr.com/ckfinder/userfiles/files/fatezojomuz.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ac8d51a4---dobuvewifuxarovesawo.pdfIn PDF document text
- http://stilistspb.online/public/files/uploads/files/lulatibonexopo.pdfIn PDF document text
- https://weishinclinic.com/uploads/files/202109102006395780.pdfIn PDF document text
- http://prestinoequitacion.com/imagenes/upload/files/24962616846.pdfIn PDF document text
- http://burattinojatek.hu/userfiles/file/xiwerabawufudodeb.pdfIn PDF document text
- http://marisqueandopremios.com/campannas/file/zamenij.pdfIn PDF document text
- https://petikdaun.com/contents/files/kopofapenotutin.pdfIn PDF document text
- http://vuonlan.vn/data/upload/files/belusiji.pdfIn PDF document text
- https://cissud.eu/uploads/ck_editor/files/bawifegi.pdfIn PDF document text
- http://gzky.cn/dubeite/ckfinder/userfiles/files/20210903_221730.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa32060bc---55593038207.pdfIn PDF document text
- http://kaies.cn/upfiles/210902031627451254b507mo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=shareit+original+apk+downloadPDF 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_off0000c48b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC48B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dca2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCA2	10756 bytes
SHA-256: `2e70c497c8a061406092d8c809d41fe082cde49a9ac4d65640e6ea1131230b0d`
`font_02_sfnt_off0000f525.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF525	15464 bytes
SHA-256: `cd009122eef20404c084c039bf1095b3aebec008a5234e324e3a85c4a190bd88`

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