PDF malware analysis — malicious · 3b1d130fe1536149

MALICIOUS

PDF

73.3 KB Created: 2021-09-03 01:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 063f0d3434341935a140545636ad7535 SHA-1: 098dc5f4e034a515ac170db99b2012558fc718ca SHA-256: 3b1d130fe15361499f17c861059bbd5ec6caecfc0fd9ac022c59e04e1ccb646d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=zaldiar+effervescent+ulotka+pdf PDF link annotation
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/32983caadb0f8ed8bff621aee91fea67/xuduwe.pdfIn PDF document text
- https://www.milestonesmn.org/ckfinder/userfiles/files/puwogosud.pdfIn PDF document text
- https://burlingame.com/wysiwygfiles/file/81335305148.pdfIn PDF document text
- https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/02803a382654956a40d0f3e32c3060b2/gudizerovarujekadufepakub.pdfIn PDF document text
- https://lawina-radom.pl/files/file/mulibok.pdfIn PDF document text
- http://centralcogtc.com/uploads/file/18520949852.pdfIn PDF document text
- http://www.deco-interieure.com/userfiles/file/48491255479.pdfIn PDF document text
- https://volgogradexpo.ru/ckfinder/userfiles/files/kexewefopugaxekikitibofo.pdfIn PDF document text
- http://teplolux72.ru/upload/file/moravutekadodumolixew.pdfIn PDF document text
- http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/68189564998.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/eugdlpeh1s1i2tikon6a7dn490/joxiwuseli.pdfIn PDF document text
- http://cutencuddlybreedables.com/_images/file/49329026691.pdfIn PDF document text
- http://watthaistuttgart.de/userfiles/file/manuwutanijisowewefozed.pdfIn PDF document text
- http://arohitourandtravels.com/userfiles/file/18345563340.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdecacdea1---41407231401.pdfIn PDF document text
- http://kalkulacka-hypo.cz/userfiles/files/36553282006.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a8ffe24dd---risemavubopimir.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/6902027690cd3fe914bb5ce1f08b406d/1171194279.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bb89d290b844fa0bd876f168afcc63a2/foxiwiw.pdfIn PDF document text
- https://alice-immo.com/userfiles/file/92719722769.pdfIn PDF document text
- http://chokmanee.com/userfiles/file/99435497940.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b633c825b82---sapakefuwulowa.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/553e2df88c3230ec3342c5bd8174c6d6/firimufoli.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1d7017bc4f8baa6144b30ef30ad37a1d/72968958811.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_off0000bbc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBC8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d3da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3DA	16884 bytes
SHA-256: `089d2108b43606faf98eef11e71300db9ee9da502af2779daa254d7a9f6b71e5`
`font_02_sfnt_off0000fe97.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE97	10832 bytes
SHA-256: `086e5a2ee7d35aecab8e5b542e096159910cea77280ba1844206be7b09ad13d6`

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