Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c73ed522ae5449…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 01:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55ef2e218fb5bc248deeb01ef0982ee2 SHA-1: 4dfd80f723d15e1084ef56c6ab37fa5cee96a224 SHA-256: 47c73ed522ae54494e690c008a1931f44566e0d4d73582cfed04965971bbef55
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, directing users to multiple disposable hosting domains, some of which are compromised CMS uploads. The embedded URLs and the heuristic firings strongly suggest an intent to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4747

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://wietsevoermans.nl/ckfinder/userfiles/files/fuwutezojemiterubemogepo.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613929a517f9f---1945801624.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/88444820656.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/110519414090.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/12832970172.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347a46cf62a---fipufigonaxelazewulukopa.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/70532776653.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/86051405155.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/fomuzikoretogozox.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/bonuziviga.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/bebemosibugumerotiw.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/loxamiseka.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd91be283---59508961712.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/3808419165.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/wodakinitakuw.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/37742059997.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/guwaxifonefirirukan.pdfIn PDF document text
    • http://storemisr.com/uploads/files/tafaz.pdfIn PDF document text
    • http://showdoimovel.com/files/files/29365402607.pdfIn PDF document text
    • https://webmenuplus.com/images/file/rusevolelofitujule.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/favarufudodijamisisepaja.pdfIn PDF document text
    • https://advik.net/userfiles/file/xefapuzezu.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/43909739479.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/bomerijeborunininilumas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fake+caller+id+apk+modPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/22117134826.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.

FilenameKindSourceSize
font_00_sfnt_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 10376 bytes
SHA-256: cf9425403a59bc6edb67abac48be9155924de8cfe443e07b89a560ba20d216df
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 22156 bytes
SHA-256: 9478e15342ab934cfafe9566e24b2394a97568f3feb2d4bcdc545804dc6882c0
font_02_sfnt_off00012b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1