PDF malware analysis — malicious · ec82835d17c873b2

MALICIOUS

PDF

91.0 KB Created: 2021-08-21 00:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e5bb98f8ae956365df10d722eb9cafc2 SHA-1: 9296d51fcc45d79e05cb86dc4da6f1a2837e76c7 SHA-256: ec82835d17c873b21dec311b0fe4758f8a4396d6b2f28f3f172068b9c1abe2e8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised CMS upload directories, suggesting the PDF is used as a lure to redirect users to potentially malicious sites. The presence of link farm heuristics further supports this, indicating a pattern of distributing links for unknown purposes.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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=the+kissing+booth+2+cast+south+africa PDF link annotation
- http://aweibel.com/Photo/file/xisifa.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3094dd8d5a4f7a5d3bd74a80b20a6032/3563228612.pdfIn PDF document text
- http://zwickerfoto.hu/_user/file/noradevijilanu.pdfIn PDF document text
- http://pierrevillers.fr/mairie_files/file/mitifokaxi.pdfIn PDF document text
- http://beachfirebrands.com/userfiles/file/86423550695.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a7079d616---29501246146.pdfIn PDF document text
- http://gfzgt.ch/upload/file/winikesanifogupinur.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/3a5e33363674e015b75181ccd1335d47/muwomowogojaxomopiluxuka.pdfIn PDF document text
- http://sieuthivatlieuhoanthien.com/upload/files/tusofidafupoju.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608c89320b8db---gupotavumajos.pdfIn PDF document text
- https://mb-classic-service.de/userfiles/file/65389578493.pdfIn PDF document text
- http://synphabase.ch/upload/file/81063557644.pdfIn PDF document text
- https://rockyhotelsgroup.com/uploaded/files/76774304509.pdfIn PDF document text
- https://paperland.bg/uploads/file/83815807942.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ec481498c---kisiduvopupe.pdfIn PDF document text
- http://clinivetmadonnadirosa.eu/userfiles/files/20553079591.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/36549880491.pdfIn PDF document text
- https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/xizenutoluxajufexenoloka.pdfIn PDF document text
- http://lotusburbank.com/uploads/files/ganipezolibebe.pdfIn PDF document text
- http://jtipartner.com/ckfinder/userfiles/files/jomijukovesavujedumukol.pdfIn PDF document text
- http://www.ags-sib.ru/ckfinder/userfiles/files/fiwojedomexit.pdfIn PDF document text
- https://agrilaui.com/userfiles/file/tupimiradijusalopizedexax.pdfIn PDF document text
- http://jn-zhsc.com/upload/dimilatafumaniwataduzite.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8fa45bb4a---71188449165.pdfIn PDF document text
- http://kstarsmall.net/userfiles/file///xetisuxesaladozipepuna.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_off0000fd33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD33	10984 bytes
SHA-256: `024b9dcf4da40da22768de5b8f8a6cfc126c76534156eff640e0ae674a295383`
`font_01_sfnt_off000116c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116C2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012ed4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ED4	17196 bytes
SHA-256: `9cd18010698819e90e3a6129198ae91a7a3407f4cc00e86d8a0e1bb568cf03f2`

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