PDF malware analysis — malicious · 4bc61eaecc96cac6

MALICIOUS

PDF

75.5 KB Created: 2021-07-13 20:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 28eb7d551915f43eb0689480081c7fcb SHA-1: 5e90ff916e22c33551be12a4fe87a0446421926f SHA-256: 4bc61eaecc96cac6670ae79d157c0fb125bbd2e31b83a6e947ba00aef3d6fcd0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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 http://volkshilfe-ktn.at/images/content/files/mokoboru.pdf In PDF document text
- https://migger.dk/userimages/file/5687252015.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e533afe2ff029607c16395b3a21f810a/61831632856.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/44v3s9or5bc2fr4okp4mnhgr9t/61903507234.pdfIn PDF document text
- http://www.juniorcollege.cl/ckfinder/userfiles/files/69227532512.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77afcf3280---tuxajuxopamibur.pdfIn PDF document text
- https://ctsgroups.asia/images/file/towaxotuwukevu.pdfIn PDF document text
- http://maychamsocda.vn/images/userfiles/file/turasevusagoximebe.pdfIn PDF document text
- http://progfin.pl/userfiles/file/tijuv.pdfIn PDF document text
- http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460cd4d015---lupugumam.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/094ca3ce77b34498dcaec490f39eef19/favibasuxo.pdfIn PDF document text
- http://okmarin.ru/userfiles/file/65108489762.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/q659idqdq4agnns8fc2kvc5f82/8753458464.pdfIn PDF document text
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/8lfc15ld15tnn9t40uh6gpecnn/nipatoxol.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ac2b3737f---kozatol.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a92105f6---6307781955.pdfIn PDF document text
- https://atesolve.com/ckfinder/userfiles/files/43366892620.pdfIn PDF document text
- https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/0a7660362e6984c54d6b10eb821761bc/80896248620.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608715db48ee4---bexezoriwijaz.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089efd4d265d---983920036.pdfIn PDF document text
- http://ginzaoakland.com/uploads/files/fipefodolebevozone.pdfIn PDF document text
- https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799f7069cb2---68562837733.pdfIn PDF document text
- http://studiomanzella.com/userfiles/files/33412631513.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2f8a7b57421f3ea1301983d5c6d94591/fonemusa.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=asia+pacific+map+vectorPDF link annotation
- 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_off0000c645.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC645	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000de5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE5C	10536 bytes
SHA-256: `4e431fd82d33efce43f279faf20430aa8916bae0bc1afa600e32b732b2189794`
`font_02_sfnt_off0000f673.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF673	16344 bytes
SHA-256: `15f1c18cd781047c6edca3e5c96961502cc2b915ec0a79a5559025a64e935e34`

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