PDF malware analysis — malicious · 01cf890920b59f57

MALICIOUS

PDF

69.3 KB Created: 2021-09-07 11:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 46465385184d51e2e3bd02625b128360 SHA-1: d1d6bc546e232ac5a2b1178924e889e35062dc8f SHA-256: 01cf890920b59f57d9694e50be5d1bdfa594013c1e9616344c846efade4bff9e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating it functions as a link farm. The embedded URLs and link farm heuristics suggest the document's primary purpose is to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=phonogram+printable+worksheets PDF link annotation
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/784fb70bf147961d4fc7829dedd41462/38615854415.pdfIn PDF document text
- https://cottonweb.net/userfiles/file/tenusawerukarewoze.pdfIn PDF document text
- http://yuli-china.ru/d/files/6109197728.pdfIn PDF document text
- http://paitoonbox.com/userfiles/files/96478736463.pdfIn PDF document text
- https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8d628052eef7134b2a1613873ae3fc81/vomawip.pdfIn PDF document text
- https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/faad80f71e2c31b7fc519156dc2bd4dd/14515714171.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607999f3e5b7d---gepabona.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f4cb968c2719cf4875f84b0b13774793/67950741154.pdfIn PDF document text
- http://x04ydivan.ru/userfiles/file/71832014010.pdfIn PDF document text
- http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/82793471a0eed5004d53cc96da6a9013/64486785155.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d08a3529e1b---bumobokiziwegegij.pdfIn PDF document text
- https://arrad.ch/modules/ck/ckfinder/userfiles/files/komadesofepelofew.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2339e002---70192950384.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/93f318f911f828a2d21b11fb15056f39/lexewamikolegidid.pdfIn PDF document text
- https://infotechsystemsonline.com/ital/www/img/file/1946435460.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4ac7d54ec92c304891e3854554f16a59/56431218396.pdfIn PDF document text
- https://polytex.de/sites/default/files/vovuxilo.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607687075c140---49882149313.pdfIn PDF document text
- http://upoart.com/ckfinder/userfiles/files/wukiwelugonabirevazo.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb2f11b818---33331952907.pdfIn PDF document text
- https://wsbtitan.com/images/file/59410450629.pdfIn PDF document text
- https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/c32c8092c53070a5d72abf7e48ff36ad/todamuwutevezewepi.pdfIn PDF document text
- http://coming-c.com/userfiles/file/sadumanoxijosib.pdfIn PDF document text
- http://grandchainfamilyfoundation.org/clients/85333/File/7889496567.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_off0000b1f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1F0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ca07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA07	11016 bytes
SHA-256: `9a05748e0334cc876098df1eb60b401d5ddd38ceddce3f715a424904332f63ad`
`font_02_sfnt_off0000e347.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE347	14724 bytes
SHA-256: `8008bdb9e8fec14b4949936ffbf1cf4da6fcb27b553a177385d439053ee36e3c`

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