PDF malware analysis — malicious · b333af357a8bd4e9

MALICIOUS

PDF

84.7 KB Created: 2021-08-16 03:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 0e4f042c3d9d42dc6b97f23c742ee4c7 SHA-1: d9dfb0f8a17b51a6f557a90761f8d326bd02577e SHA-256: b333af357a8bd4e90a459cf540813fca48763000083fa9d12bb79fc8eee7906d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress instances or disposable domains. This suggests the document is designed to lure users to malicious websites for phishing or to download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://softwarefactory.nl/images/file/xixuvomekabasepadabu.pdf In PDF document text
- https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/17617214718.pdfIn PDF document text
- http://watthaistuttgart.de/userfiles/file/xutof.pdfIn PDF document text
- https://pasarantogeldua.com/contents//files/medamojuxep.pdfIn PDF document text
- http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844d25f2e08---zofojaji.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c31a51844d---figejawafe.pdfIn PDF document text
- http://vpecargo.com/userfiles/file/lebodomomonanotizuk.pdfIn PDF document text
- http://burelomdo.com/ckfinder/userfiles/files/49034562011.pdfIn PDF document text
- https://drvishweshwari.in/userfiles/file/gexir.pdfIn PDF document text
- https://balajitutorial.com/admin/userfiles/file/17385540313.pdfIn PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/bf2aa6b67dc4202d17f369c1df4cde07/zexuwo.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac76eec71---45592100939.pdfIn PDF document text
- http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/58225672644.pdfIn PDF document text
- http://wallsfamily1912.com/clients/876683/File/45573711185.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6b3eae4ae9fc076a31ca7d379db02eb3/58427341351.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160863c7787ba4---dowamorupuwalusoden.pdfIn PDF document text
- http://dijladentalcenter-qa.com/userfiles/file/6820007113.pdfIn PDF document text
- https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c548bb611bd001fdf03c0ecebfcef392/5865566414.pdfIn PDF document text
- https://toptenstudy.com/upload/files/BodyFile__60BC068C94E90.pdfIn PDF document text
- https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/1e0dd52b5ec3714be5391822cf7c203c/85754207780.pdfIn PDF document text
- http://veterina-hrib.cz/user-uploads/files/dabedalejunewomosi.pdfIn PDF document text
- http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aed97982d---siwusaledejapetafa.pdfIn PDF document text
- http://rajhansnursery.com/userfiles/file/tufegozigategumedaduwojuz.pdfIn PDF document text
- http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611963fcd36ca---muberewuwep.pdfIn PDF document text
- https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ec8f79d49e2513033df6da86b36d2e13/lelojuveterez.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/heetfdmpi55n96fmo72e078rq5/maxezalid.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=romeo+y+julieta+libro+completo+por+capitulosPDF 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_off0000e631.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE631	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fe43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE43	17316 bytes
SHA-256: `7583271ac6cb184ad1540d9f5059ee4763f06f0da11dc758c692dc6a0f50c724`
`font_02_sfnt_off00012a1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A1B	10960 bytes
SHA-256: `682d5051711a74bca48c6846b8bbccb35aff4c75e7d55596dc0e146b9124a5cc`

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