PDF malware analysis — malicious · 06680c71c51e6382

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 08:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 3f50f53a4baecec465b19e4ca15e331c SHA-1: 1936e13b68b0ccc34d6f3af6671076b93f27faef SHA-256: 06680c71c51e63826c5b789e961c4d38f7e3fe4607dc0d540f7ce01cc285c193

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV heuristic identifies it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lead users to malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier clean score 0.2223

Heuristics 5

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
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://smidgel.ru/uplcv?utm_term=warhammer+40k+tyranids+codex+pdf PDF link annotation
- https://soportedevida.mx/ckfinder/userfiles/files/pibobek.pdfIn PDF document text
- http://hum-lucknow.org/test/fckeditor/file/69957033830.pdfIn PDF document text
- https://techlan.pl/files/file/61809234294.pdfIn PDF document text
- http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c99e26cbe---ditawodomujedugela.pdfIn PDF document text
- http://clairerolo.com/userfiles/file/55337368652.pdfIn PDF document text
- http://sushinamu.com/uploads/files/75360062283.pdfIn PDF document text
- https://vanphongphamhienluong.com/upload/files/paduzafowoboxilisoje.pdfIn PDF document text
- http://elpijisystem.com/file/dokuniwuwe.pdfIn PDF document text
- http://gk-eventus.ru/admin/ckfinder/userfiles/files/2191395350.pdfIn PDF document text
- https://kcss.hu/korosi/userfiles/file/zuxerorujivedevekak.pdfIn PDF document text
- http://xinyaoqiye.com/upload_fck/file/2021-9-3/20210903132706340519.pdfIn PDF document text
- http://apsencollege.org/test/fckeditor/file/muwojopijizumoxalekulalo.pdfIn PDF document text
- https://petpetmates.com/files/editor/file/50270073509.pdfIn PDF document text
- https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/36137529774.pdfIn PDF document text
- http://athaj2.specialty-match.com/upload/files/6635884243.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307c998ccac---simotukub.pdfIn PDF document text
- http://kutscher-customs.de/gfx/userfiles/files/57909279543.pdfIn PDF document text
- https://sibservis.com/ckfinder/userfiles/files/xisavexowumujimulabosuxim.pdfIn PDF document text
- http://symbioticlifetech.org/attfile/fckimg/file///2021090435948_299421729.pdfIn PDF document text
- http://thienminhgroup.com/uploads/userfiles/file/vamadefokevubugosusabo.pdfIn PDF document text
- http://kondicionery-himki.ru/upload_picture/file/tozidiburesawufi.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137553e1d6a6---rigapezewi.pdfIn PDF document text
- http://mezon.jp/userfiles/file/wivexuv.pdfIn PDF document text
- http://z-sinpro.com/upload/files/48114015919.pdfIn PDF document text
- http://tvsatkrosno.pl/userfiles/file/71411712291.pdfIn PDF document text
- http://sbriz.ru/userfiles/file/94268131251.pdfIn PDF document text
- https://cakamuzejs.riga.lv/ckfinder/userfiles/files/91808448065.pdfIn 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_off0000cb6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB6E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e385.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE385	11340 bytes
SHA-256: `b8886b211c0c91fb9daeb80b72e16df973cc19c4d4dc5de15940b1c0ad46bb14`
`font_02_sfnt_off0000fe1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE1B	17168 bytes
SHA-256: `350e177510b37508522c8453f636cd567628d89228aaf2e5002bebc1b74cc961`

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