PDF malware analysis — malicious · 116355ecb559a6c5

MALICIOUS

PDF

76.0 KB Created: 2021-09-20 15:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: b464c9e5704fc9d4fd6ee24b8570d310 SHA-1: 741c4b2700d9339df665a184756f3d5e437780cf SHA-256: 116355ecb559a6c55c675cfd02a3f62def772a2548e539d56f18123294a5f303

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://catamma.ru/uplcv?utm_term=clash+of+clans+new+version+2020+download PDF link annotation
- http://villalapinetafavignana.it/userfiles/files/zegisomezajekifusumak.pdfIn PDF document text
- http://zekejozsef.eu/FCKfeltoltott/file/koxolodibolapemesege.pdfIn PDF document text
- http://drsuthichai.com/userfiles/files/37832170644.pdfIn PDF document text
- https://reparationmobile.net/userfiles/file/36001485319.pdfIn PDF document text
- http://amicissiapiemonteisa.it/userfiles/files/32505829719.pdfIn PDF document text
- https://shipnhanh247.vn/asset/files/jasuzaj.pdfIn PDF document text
- http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sowula.pdfIn PDF document text
- http://anais.terminarz.online/kosmetyczka/krakow/files/87017923561.pdfIn PDF document text
- https://hotelharmika.com/assets/userfiles/files/23880848359.pdfIn PDF document text
- http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16146cecc7fedc---26958526103.pdfIn PDF document text
- http://tonyprins.nl/images/uploads/file/31386552169.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e916b7b4---sobuwajifulamob.pdfIn PDF document text
- http://dpnovelty.com/upload/files/sunilitetosugimuka.pdfIn PDF document text
- https://lose-weight.tw/upload/files/22851742173.pdfIn PDF document text
- http://megaprestige.ru/uploads/files/xukajorenegagerev.pdfIn PDF document text
- http://autoscuolapezzano.it/userfiles/files/kovutivapoxos.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/844edc8be55524b4f8fd5649fad1681b/41469437737.pdfIn PDF document text
- https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0ddua28mk3fh2hgca3l0vgacpu/66630032175.pdfIn PDF document text
- https://jackinthegym.com/uploads/files/202109021914478378.pdfIn PDF document text
- https://shiokuda2.com/contents/files/gatezufuzikad.pdfIn PDF document text
- http://naplesredeals.com/userfiles/files/rebizaz.pdfIn PDF document text
- https://landtop.com/filespath/files/20210909221826.pdfIn PDF document text
- http://wedding-box100.com/uploads/files/202109181606008444.pdfIn PDF document text
- http://grimastone.ru/files/regovozevudozoliw.pdfIn PDF document text
- https://pleasanton.com/wysiwygfiles/file/91108272635.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_off0000c861.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC861	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e078.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE078	10900 bytes
SHA-256: `b2fc4509c19f0df9f1e7313cefbdf50e6c79f007d4a095869b8356b053240415`
`font_02_sfnt_off0000f9ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9BA	15900 bytes
SHA-256: `a8763f210ee438a1d0fece52bd18729cd08d317c62915b0bff3816b461c77294`

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