PDF malware analysis — malicious · ad7024bdc7dad541

MALICIOUS

PDF

100.0 KB Created: 2021-08-21 01:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: ace1502ab572ce469698f419b3cfa1c4 SHA-1: e98dbbb496c19b081f8514c01d75f5bb8b10f733 SHA-256: ad7024bdc7dad541f35d0e8fa81a89f5cbc84e96af3419c6eda8997f463751c0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF 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 many URLs pointing to compromised WordPress upload directories. While no scripts were explicitly extracted, the presence of external URIs and the nature of the link farm suggest it is designed to redirect users to malicious or phishing sites, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9875

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/971h2kl6e0k0qskjn6ta8mpu92/70455899841.pdf In PDF document text
- http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/ca4c2902c431d28ce5827a6188f47184/zawofugefunutibope.pdfIn PDF document text
- http://bearings-home.com/userfiles/file/roragefujeburadebab.pdfIn PDF document text
- https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/o2kcvfpqolfcl92n11r53pepbb/movufuzujubesububuxefid.pdfIn PDF document text
- https://andrejc.si/files/file/vurojaniwina.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/98b03ef40e8209722b2bc415cb30b295/tipezuvovevosigaxurate.pdfIn PDF document text
- http://feynburg-uhren.de/uploads/tipovuzi.pdfIn PDF document text
- http://mashtalkandil.com/userfiles/file/66128169411.pdfIn PDF document text
- http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/koronubuduxoriwolones.pdfIn PDF document text
- http://soluzionebenessere.eu/userfiles/files/sebutuzirawubopu.pdfIn PDF document text
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2579c088da---69222785198.pdfIn PDF document text
- http://flagrant-desir.com/userfiles/file/zosimirikafikugakamamakeg.pdfIn PDF document text
- https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a2adb47f---39619965929.pdfIn PDF document text
- https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1e3493755864be61d5d26578de0cbf10/51806654707.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1baa4376b468a67e812c9f9766bda86a/14800031317.pdfIn PDF document text
- https://nslogisticservice.com/userfiles/files/fikuwerufozajajol.pdfIn PDF document text
- https://fzclicks.com/demo/files/editor/file/loxonolesodejunowovomox.pdfIn PDF document text
- https://cardion.dk/gfx/fckimages/file/98244125296.pdfIn PDF document text
- http://nkland.org/userfiles/files/ziwapigiwukex.pdfIn PDF document text
- http://jaatkinson.com/userimages/latitunilujegamewajabavi.pdfIn PDF document text
- https://noriupapildu.lt/ckfinder/userfiles/files/wajupiz.pdfIn PDF document text
- https://soudurelauziere.ca/upload/editor/file/tofofus.pdfIn PDF document text
- https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/9da7d897978a9b643ae8e6d588d65cad/89537039090.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d7ed9b58b3c17fdb38776eaaf95e7849/45685222048.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b40135a06---5977220672.pdfIn PDF document text
- http://densayhongngoai.com/uploads/userfiles/file/13706881061.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tv+show+proposal+sample+pdfPDF 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_off00012549.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12549	17332 bytes
SHA-256: `5f7d31debade84efa829206c236f12722222a61d6b1567c590ac31b267ef75f5`
`font_01_sfnt_off000151fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x151FE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00016a15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16A15	10584 bytes
SHA-256: `0a8168aa14db5bc130559825cf96480bdcf636c82735ee36f1ba0455674cc537`

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