PDF malware analysis — malicious · 4fafdb950f3e29c3

MALICIOUS

PDF

97.8 KB Created: 2021-09-05 10:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27

MD5: 6a1bcb236c380f3cbb78e165e54dbb7a SHA-1: 19087a17b145cdfe37b075ddb6afc449c9959d93 SHA-256: 4fafdb950f3e29c315a3a6df1cfbf021934b73147ef001a984756a09d717af44

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple URLs hosted on compromised WordPress sites. These links are likely used for phishing or to distribute further malware, aligning with the characteristics of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9961

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://archism.ru/uplcv?utm_term=ppp+eletricista+preenchido+pdf PDF link annotation
- https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078410ca17b4---bolawekorukeme.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfc742c29---lewivofikoparuto.pdfIn PDF document text
- https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2e409d4a5206ada89ba1334872cb56a5/52630247264.pdfIn PDF document text
- https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/cd5a57bb83b76a967ccad151cc977033/40526691579.pdfIn PDF document text
- http://hpcad.pl/Upload/file/79520740343.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2bdc938fa---9486938165.pdfIn PDF document text
- http://hotelgiottotorino.com/userfiles/files/30395215575.pdfIn PDF document text
- http://mengnuanua.com/app/webroot/files/files/tadepon.pdfIn PDF document text
- https://trungtammatnamviet.vn/upload/files/megorapodebosub.pdfIn PDF document text
- https://textmakareknutsson.se/upload/image/38774395513.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0f9514ca9---3496388294.pdfIn PDF document text
- http://hoclaixebinhthuan.com/upload/contentFile/file/pavuxibupaxe.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b58a2f3a1---75668274052.pdfIn PDF document text
- https://syteq-pro.com/userfiles/file/11154925869.pdfIn PDF document text
- https://www.jnvhardoi.org/ckfinder/userfiles/files/xunafubelab.pdfIn PDF document text
- https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c54d8f60e89c2a8e0ebabe94e149039b/wenolozipitezupuz.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fc4a8beae---55122621491.pdfIn PDF document text
- http://donauwell.at/userfiles/file/89694372908.pdfIn PDF document text
- http://firewheels.pe/userfiles/file/nisesux.pdfIn PDF document text
- https://prana.video/wp-content/plugins/super-forms/uploads/php/files/fkoubh19352l6dbl37fqkk7a1i/waxufekidimani.pdfIn PDF document text
- https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/i67d42ueh8o0culkd7qakkrt96/77530334203.pdfIn PDF document text
- http://screen.by/images/file/60409575548.pdfIn PDF document text
- http://hcstonetw.com/uploads/files/202108231019436080.pdfIn PDF document text
- http://clinicaveterinariailmarzocco.it/userfiles/files/6701009398.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_off00011489.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11489	10716 bytes
SHA-256: `0c4611a29d4ff4953fa4e15e262dae92c0b355d844330746c6940daeeb79aa1b`
`font_01_sfnt_off00012d0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D0D	19948 bytes
SHA-256: `759eaef3a0d469fd6a62a34fd790c6ed66c49b0c5d3183ca9732b2541fc0220c`
`font_02_sfnt_off0001615c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1615C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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