PDF malware analysis — malicious · 9b4645c672494429

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 01:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 8e7b8734ff4bfa19893b49d952b9abb2 SHA-1: c1116ff4152f847fcfb882f4e8f9d27f011118da SHA-256: 9b4645c6724944295ca498878a3eb5d2499d8666b9a9a9b095466ec6d7ec3bb0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing or trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://crewmak.ru/uplcv?utm_term=love+2.0+pdf+download PDF link annotation
- http://terezmisszio.eu/files/file/98326537410.pdfIn PDF document text
- https://n-zvuk.ru/upload/file/7696516462.pdfIn PDF document text
- http://www.annaleehuber.com/content_files/file/famiwepaxagaritem.pdfIn PDF document text
- http://creative-format.com/upload/editor/files/keratopikonel.pdfIn PDF document text
- http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa753e137d1---naxiponaxobeloj.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d3ac64ba92e7cdb559c13ef5cb7a32d2/zixijataro.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/30e83b3b22d183167038546f1c74370a/80605555976.pdfIn PDF document text
- http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161133372d56a1---forewusi.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hvbs0m7d85jjtsv2m4i2cvskf2/33947490549.pdfIn PDF document text
- http://koreaseals.com/ckfinder/userfiles/files/vizuwezi.pdfIn PDF document text
- https://myphi.biz/nbloom/fckuploads/file/ninonejivibetivawomuru.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af67c2ac8b---sasipidirupubozedunoved.pdfIn PDF document text
- https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/hafjpcl8uipfd7lm7u8cpmgqjj/72790605840.pdfIn PDF document text
- http://www.radio-kum.si/data/files/bipegigivapuwat.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607212eeb57e8---88357460290.pdfIn PDF document text
- http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/koxikatumabarokowal.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba900e5cf---99948437706.pdfIn PDF document text
- http://amadpich.com/userfiles/file/3476886965.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17b47b72e---24307613601.pdfIn PDF document text
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9cfc147d2a399be9644b5dcfd8037bda/weluwabofebobosezu.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3e992da1---89006770351.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a702f3ff5---fajipozefipa.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a4753c85---daxadur.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4dad3e6da---gidera.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebe4edcb92---26425951409.pdfIn PDF document text
- http://csc020.com/userfiles/file/20210806020034_nr0gch.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_off0000e35e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE35E	17424 bytes
SHA-256: `2796f71776efb5dfcce5f2262e6ef9b4a2847b7e5c27cb16800629125bc83245`
`font_01_sfnt_off000110c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110C8	10452 bytes
SHA-256: `aac05338fb5b927893ab1f9142047ac031ae3c0fce1747d131686e5612e33b4f`
`font_02_sfnt_off000128bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128BC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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