PDF malware analysis — malicious · 5585a0859d6e7a0d

MALICIOUS

PDF

82.1 KB Created: 2021-09-24 03:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: c684f7c3c079186957833c37362fd568 SHA-1: e275c1a8aa79943b442cccbbae7000464dabda8c SHA-256: 5585a0859d6e7a0d4052162139a9ce3757767c05f31d06664b2e0a1ef73a01c7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links are likely designed to redirect users to phishing sites or download further malware, aligning with a common phishing or malware distribution tactic.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://irlanc.ru/uplcv?utm_term=deleted+audio+files+recovery+from+android PDF link annotation
- http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ccde7de9ba51e33e5cdb7202be86f29e/7509134563.pdfIn PDF document text
- http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/97448104214.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ce77d8abfbb40a215b71642d943611bd/9022450551.pdfIn PDF document text
- http://sake-tori.com/images/library/File/bikanizetebipesane.pdfIn PDF document text
- http://flooroverstock.com/admin/userfiles/file/jupafevijanivotep.pdfIn PDF document text
- http://raffaelecavazzoni.com/userfiles/files/gisixi.pdfIn PDF document text
- http://box8websites.com/ckfinder/userfiles/files/71655317864.pdfIn PDF document text
- https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/39d7432dbe420f5ca07038ff8f093b65/pitetap.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/34184080104.pdfIn PDF document text
- https://lotte-ppta.net/beta/assets/file/6236993299.pdfIn PDF document text
- http://wonikqnc.com/upload/editor/file/1630555395.pdfIn PDF document text
- https://olterus.net/contents/files/gowajavalefaralixiz.pdfIn PDF document text
- https://loctra.net/userfiles/file/72910228048.pdfIn PDF document text
- http://www.parinet.fi/tiedostot/files/45912130964.pdfIn PDF document text
- http://purepassion.pl/userfiles/file/newiwuzizalagamamo.pdfIn PDF document text
- https://greenways.at/userfiles/file/rajolufobofase.pdfIn PDF document text
- http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sazol.pdfIn PDF document text
- http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1b515d3d2---94182486901.pdfIn PDF document text
- http://cn-biyoute.com/d/files/54847558361.pdfIn PDF document text
- https://bitree.com/ckfinder/userfiles/files/74951175189.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379fbe4ae72---kajebiwiregedunaguge.pdfIn PDF document text
- http://mebel-moscow.com/content/xuploadimages/file/tizibekagokepab.pdfIn PDF document text
- http://1000projects.ru/upload_picture/file/16862285750.pdfIn PDF document text
- https://baglab.pl/galeria/file/56775603687.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_off0000dc35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC35	10916 bytes
SHA-256: `244102b3bdda5b2d0a0c579d01a34489529c76c616449df0771ceba0e30d7803`
`font_01_sfnt_off0000f586.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF586	17648 bytes
SHA-256: `ac51daca39803a123d6d6976ba781c28d85030a0241173dad0c9cd00565a136a`
`font_02_sfnt_off000122ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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