PDF malware analysis — malicious · 669b9170fe651d2a

MALICIOUS

PDF

94.5 KB Created: 2021-09-06 01:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 08c10e142c1dc65927182b3e358a9b05 SHA-1: 66da26ad4f36233c6fba7efb3c1059670e54ff67 SHA-256: 669b9170fe651d2a4c1f0ca02ca136e048ab4814318cd83e1fc092a1b4d7b135

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, likely intended to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a container for malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9897

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://oniceh.ru/uplcv?utm_term=tareekh+e+islam+by+shah+moinuddin+nadvi+pdf+free+download PDF link annotation
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611412fbdac00---vovovatojajezulibabet.pdfIn PDF document text
- https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701ff47e210---loxasefugenaz.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b33cdf75775e85640f56ab51adc837c3/koxafem.pdfIn PDF document text
- https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/27b7fbb721e89cd1816e9f7e21f90365/lavaluvemeteridijidiki.pdfIn PDF document text
- http://heldermusic.nl/ckfinder/userfiles/files/jisofamaluti.pdfIn PDF document text
- http://dambi.pl/userfiles/file/xikumivipadub.pdfIn PDF document text
- https://visualarchive.bg/files/sujopunimunuzib.pdfIn PDF document text
- https://arerp.kr/data/file///petovebugurifeto.pdfIn PDF document text
- https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc20c43eea---4713897543.pdfIn PDF document text
- http://simonide.org/userfiles/file/lorajumuzoli.pdfIn PDF document text
- http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/qraooo15ta0llf8l0m1j03kip3/kanub.pdfIn PDF document text
- http://xn--80akoseq9f.xn--p1ai/userfiles/file/3245289490.pdfIn PDF document text
- http://virus-safe-zone.com/ckupload/files/776883837.pdfIn PDF document text
- http://bahattinburyan.com/userfiles/file/71739260073.pdfIn PDF document text
- http://keitbg.com/images/files/ragefewavazevarafome.pdfIn PDF document text
- http://cartopack.com/Images/file/mejusewafogarif.pdfIn PDF document text
- https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/8e9c6de96f0c1a368f20789a10db5752/39373804982.pdfIn PDF document text
- https://h1t-url12shio-turbo.com/contents//files/960629383.pdfIn PDF document text
- http://palletgoanloi.com/img-dn/files/sawapifijizifiguf.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609165ddb9990---64399148202.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/fq51qeb5oog5b95237j6tgv6bm/pimulokesurabirazevipozo.pdfIn PDF document text
- https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9e4c4a6c---41552998280.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ac7b5abb7d975330cba512daf40624f5/bodubija.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118728e78507---57028351955.pdfIn PDF document text
- https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c58fc01179ee90d00447f73d9270c532/magazaxuvubiwexag.pdfIn PDF document text
- http://www.la-rocca.pl/app/webroot/files/files/65814946443.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_off000109e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109E4	18328 bytes
SHA-256: `5633b776d3e91ab8c443d47a64ae2d6ea7f366585a97aae5501084017c691949`
`font_01_sfnt_off00013940.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13940	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00015157.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15157	11228 bytes
SHA-256: `7ae64a3e00e10642a8ca9b42472d6378c5ea3bc7771b5beb36efa69aebc5fb25`

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