PDF malware analysis — malicious · 50f02c7eeb09154f

MALICIOUS

PDF

93.7 KB Created: 2021-07-04 17:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 280bd5b45d82a63bd4a9b43971527bda SHA-1: 28ffd7193f0e1f42e4a560ad058d8c71e239c7af SHA-256: 50f02c7eeb09154f90a4366a0400606e16cbb0d88b8f8308c2160aac1eaef4f2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are likely part of a redirection chain to deliver a malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://royal-art.pl/uploads/userfiles/files/kokozasemuf.pdf In PDF document text
- http://dongshengcable.com/images/upload/File/duxepitidi.pdfIn PDF document text
- https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c9ec7afaf2da8c8ca4120f56134336ab/gewafufib.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072e50716746---31448359950.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d052267ff3f---majunamumafuvamuzagik.pdfIn PDF document text
- https://atphp.ch/userfiles/file/bijizuwiwavobilazakorusov.pdfIn PDF document text
- http://cl-metalparts.com/d/files/butugivoko.pdfIn PDF document text
- http://teplospectr.ru/images/files/27731919150.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081862616262---juvexipopanafutavera.pdfIn PDF document text
- https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/0bf806c1a5b21531d1a5cda13999dd6b/81181485715.pdfIn PDF document text
- https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/c92c47fe18db32c16bb0c546d1af519b/20836722816.pdfIn PDF document text
- https://ohcsi.com/ckfinder/userfiles/files/sasajisibalijogotujib.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b573248c8d1---zavixitoled.pdfIn PDF document text
- http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a5b255d18dc71eb098b975fec83045c9/9838209199.pdfIn PDF document text
- http://ackerviewguesthouse.com/userfiles/file/43227706779.pdfIn PDF document text
- https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/q1u80fqr040hf9l48joa9diphv/kozizovitanaloga.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607289655df9d---49859146492.pdfIn PDF document text
- https://kitapkapla.com/upload/ckfinder/files/32581504733.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609630ea7b351---58844882900.pdfIn PDF document text
- http://aaaexpressheating.com/userfiles/file/rerazupowube.pdfIn PDF document text
- http://seabeachthailand.com/UserFiles/file/kowujukafejevoda.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/58495595591.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j0ho5nbetsceq00fpnm5n43uo0/11491028932.pdfIn PDF document text
- http://aceonlinementors.com/userfiles/file/91026749025.pdfIn PDF document text
- http://mjsolankifoundation.com/fck/imagesfile/mejakejul.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+countable+and+uncountable+nounsPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f31a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF31A	18012 bytes
SHA-256: `b50604dc16a55a54a9b05b94da5bcb8a16d5f66aa388a05aa3e30909ee942880`
`font_01_sfnt_off0001211a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1211A	16348 bytes
SHA-256: `fdc3f250e16d4eeaac0151c08e1678493ac6cc67090af3137bc700c4cd553891`
`font_02_sfnt_off00013772.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13772	10476 bytes
SHA-256: `7a41f939e2ed573e8c2e1330e5fe7d20dc50bc1ed406e6051c8a8019597adca9`
`font_03_sfnt_off00014f38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14F38	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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