PDF malware analysis — malicious · 05b46aba69d21d70

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 07:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 706f6561a80a63f933167ad64fe5358e SHA-1: 525b06967a5e80c3d5aa3be9ffd5ec164ef109b1 SHA-256: 05b46aba69d21d70e3d898d25c1a9d5f4f9172c3cf35537462b1d354a5ca149b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript to facilitate malicious actions, such as redirecting users to phishing or malware download sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://smepil.com/ckeditor/userfiles/files/20872765730.pdf In PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac62de6a87e---mijexarafo.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/vskt9tot4tj1d231om16toohvc/rexizilenuxaxidatevirewow.pdfIn PDF document text
- http://findplusltd.com/file/56969078517.pdfIn PDF document text
- https://yalcinplayer.com/calisma2/files/uploads/54093819902.pdfIn PDF document text
- http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/41951410783.pdfIn PDF document text
- https://songod.vn/uploads/image/files/90222768742.pdfIn PDF document text
- https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/v592f709l0tn2eeut3ubvgmck1/gejuragowixagaxubetebo.pdfIn PDF document text
- https://vietrocknet.org/app/webroot/img/files/86566550354.pdfIn PDF document text
- http://elazentrale.de/images/uploaded/file/tuviwijotet.pdfIn PDF document text
- http://velomagazin.hu/UserFiles//file/58896577961.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074579316223---tedalofewetageko.pdfIn PDF document text
- http://net-marketing.hu/images/files/wizazetipesovidekujotene.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jmucnj5pk3lb6dnmkrit3kkb6s/37526556973.pdfIn PDF document text
- http://varadimasszazs.hu/uploads/files/rulatijepijup.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/tewinubine.pdfIn PDF document text
- http://bephoangdung.vn/uploads/ckfinder/files/91206916652.pdfIn PDF document text
- http://www.sanjuktabanerjee.com/fckimages/file/60681471532.pdfIn PDF document text
- http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/guwimelaxotigororek.pdfIn PDF document text
- http://agnieszkapawlik.com/userfiles/file/97427282858.pdfIn PDF document text
- https://senegal4d.com/contents/files/11860132860.pdfIn PDF document text
- https://travelsafeway.com/userfiles/file/lodev.pdfIn PDF document text
- http://salonorganica.ru/upload/files/70550143673.pdfIn PDF document text
- http://astro2sphere.com/admin/images/file/64265000617.pdfIn PDF document text
- http://brenno-tojestto.pl/userfiles/file/9186102772.pdfIn PDF document text
- http://bhk-aindling.com/userfiles/files/78329784955.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=optimize+scanned+pdf+onlinePDF 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_off0000c6d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6D9	16808 bytes
SHA-256: `60085163e2f7d409321892b01ef9305e3efe9432765b899c9d5a4ff527321299`
`font_01_sfnt_off0000f236.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF236	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A4D	10764 bytes
SHA-256: `e8eec0323d4101d91474992b09c98e927420d5630fd330bb7d005cea8793f8c6`

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