PDF malware analysis — malicious · 27d86e57bda4c103

MALICIOUS

PDF

89.7 KB Created: 2021-06-25 17:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 5b67e48f4f74513045598c156fab76a1 SHA-1: 0da88d8830c740ab4fc7d072bec8369920cba26f SHA-256: 27d86e57bda4c103f6e2911482cd29aa0072427a2f2b1ddd8d6e0e473b32f142

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a link farm. The heuristics indicate that the links point to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or download of malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://betalinktech.com/blmedia/file/23042851578.pdf In PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7jqlsejmkli830uj49842bc8a2/37234279356.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8026f79d11702c496c9735075fd71fd0/zedudokagotegatijalivol.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/defcd93291647c79d72f67064d588d50/xarumutafetonofitunu.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/v2mp9332ce8lt1h7d0hnbcmsss/81678644701.pdfIn PDF document text
- https://konferencii.ru/js/ckfinder/userfiles/files/94107955321.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/de5b54d3b2eff8eea04f9d585e3cea74/befebuxo.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd6d1bfdd---sawer.pdfIn PDF document text
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607909f2ee0f6---32578820085.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2eaa1c13---reberesosorajavuwoxelevux.pdfIn PDF document text
- https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/dqh72mjq52duaivq2ooqhd6ut1/36292245355.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/f83rpj1eo32m1h1390f2c2jd93/3587286851.pdfIn PDF document text
- http://dambi.pl/userfiles/file/98556124659.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b164262faca---6080268214.pdfIn PDF document text
- https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/m60jnf2u7lv7rjs993e8fc59dg/48765292451.pdfIn PDF document text
- https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1c3044a525720d6bcabd7c43716921c3/berulujizaboje.pdfIn PDF document text
- http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a59a5c9da---ropenarizifupebugomobures.pdfIn PDF document text
- https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2afd3c35---wapoduzekuzememaw.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5ef8720e---tapugutiwesuxusuxopoler.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e956677bb3584b1756fa44b6f0f41e16/58374755348.pdfIn PDF document text
- https://feng-shuiworld.com/userfiles/file/70864164030.pdfIn PDF document text
- https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5ae17712---60669824095.pdfIn PDF document text
- https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/d8968998585ee81a16dcb91f64d37e3a/54967998523.pdfIn PDF document text
- http://okmarin.ru/userfiles/file/8792615181.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=s+corporation+ownershipPDF 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_off0000fa7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA7C	10584 bytes
SHA-256: `74cc9cf4c914ac9a42d46df98478dffdc1be770b91933249d139344ade0372b5`
`font_01_sfnt_off000112a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112A5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012ab7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12AB7	17908 bytes
SHA-256: `0d0ec6dc65491d82bfc20bb6283534478e7551a969d74ff46ca11cd3f54e6e88`

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