PDF malware analysis — malicious · bff54eb7c8ccc722

MALICIOUS

PDF

93.0 KB Created: 2021-09-04 05:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 5e5f338f9023075deb4bfb931fdcc6c6 SHA-1: ad2f77e4d9e710fd6a1350b0ee81d1fb9f582972 SHA-256: bff54eb7c8ccc722206cefda9ff8796c7d5e1ad5157a52ea5f3d05819542d105

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with several URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://tktravelkorea.com/FileData/ckfinder/files/20210817_33841A70C11C5B6C.pdf In PDF document text
- https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/262c4123afbe3cae6a594f2da614349f/62837864485.pdfIn PDF document text
- http://petra-dario.info/upload/datoteke/44438170723.pdfIn PDF document text
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160804a84b696b---buwuwuv.pdfIn PDF document text
- https://aful.edu.pe/ckfinder/userfiles/files/7061161051.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083c79dccf39---tijofomux.pdfIn PDF document text
- https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/49e4a1a0b2189219e1fa9edf034dcd6c/rekefosizumoxizakisu.pdfIn PDF document text
- http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997f4fed9f3---numovobikuvesem.pdfIn PDF document text
- http://jatyn.cn/upfiles/202106/file/1624986597.pdfIn PDF document text
- https://equator-maritime.com/userfiles/file/96333191923.pdfIn PDF document text
- https://next-engineering.com/userfiles/files/93366349688.pdfIn PDF document text
- http://noahmission.org/dataroom/file/jituguxuveporonazefavu.pdfIn PDF document text
- https://tramhuonghanoi.vn/upload/files/16368903892.pdfIn PDF document text
- https://khonggiansachhanoi.vn/uploads/files/10388892935.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ros1onugbg8evgticd7uvt3et4/88819765010.pdfIn PDF document text
- http://liddellgaryfamily.com/clients/863293/File/44703874252.pdfIn PDF document text
- http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160986dd8c7edd---menuxugowurivakisoposuz.pdfIn PDF document text
- https://damiel.eu/userfiles/file/tomebaterezawovis.pdfIn PDF document text
- https://shinko-tw.com/UserFiles/file/fularipekolapovazunasuk.pdfIn PDF document text
- https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d64938b4b7f---9908985613.pdfIn PDF document text
- http://airfa.it/userfiles/file/masakezuruzifipanawa.pdfIn PDF document text
- http://protok.pro/upload/files/gibirani.pdfIn PDF document text
- https://rumputhijau.com/contents//files/dupexusolopu.pdfIn PDF document text
- http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/85156191827.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A7%D8%A8+%D9%85%D8%AF%D8%AE%D9%84+%D8%A7%D9%84%D9%89+%D8%B9%D9%84%D9%85+%D8%A7%D9%84%D9%86%D9%81%D8%B3+%D8%A7%D9%84%D9%86%D9%85%D9%88+pdfPDF 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
`stream_005_off000118e4.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x118E4	23344 bytes
SHA-256: `dd6eceea01c969e09cb2eccf7738a056b686c431d6da7db7087d360199c2e9b7`
`font_00_sfnt_off0000cd67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD67	20728 bytes
SHA-256: `07d696b6e1c163fc7f1a5068b67cb8819040944a2c72116d4b8d96becb5381d2`
`font_01_sfnt_off00010506.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10506	9372 bytes
SHA-256: `ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724`
`font_03_sfnt_off00014283.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14283	19420 bytes
SHA-256: `cbe420d242f51ecba56fe39b6cceba2117cf8e0b08c25a56292b3f246dd97192`

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