Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa326136f6df52d…

MALICIOUS

PDF

72.1 KB Created: 2021-09-09 08:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cf54f94ce2078f7a960c1adc707fee33 SHA-1: b1233c0d1cb3a5961b81720c588c0047e89c26b9 SHA-256: 8fa326136f6df52ddcf0a0095130ce33e0cd88922bcd0cedd910ffd03ef052bd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm PDF, with one direct link pointing to an IP address, suggesting an attempt to redirect the user to a malicious site. The document body was unreadable, but the presence of multiple embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5115

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://autoscuolemontagna.it/userfiles/files/20742930012.pdf In PDF document text
    • https://banghenails.com/upload/file/83902408531.pdfIn PDF document text
    • http://exosushi.com/uploads/files/gutivowizejunizo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42369a4c7---28076925234.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/71450148079.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109091051465434.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/turixelanafubuzigix.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/varesijimi.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/8433674846.pdfPDF link annotation
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/bexaweweninesuleriwijizo.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///limipelivorofijulewopop.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/xopuwetuze.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/94094807154.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ecd69dc4fd96dccc13481371d9eed1e6/sawamutoveragirowawova.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-6/20210906092027658053.pdfIn PDF document text
    • http://cke.hk/userfiles/95869937653.pdfIn PDF document text
    • http://orlickachata.cz/files/files/wojolupuvagubefizux.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/20518005004.pdfIn PDF document text
    • http://acril.ru/ufiles/files/22165307630.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/pukedudeduvimureg.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/97902620252.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/kivudewatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=blue+book+of+grammar+pdfPDF link annotation
    • 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_off0000c3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E0 10764 bytes
SHA-256: bcc51bd7023eaa21e6823b7d047b448ae3aae03ae7c335da6f0c7bfab8cd94ee
font_01_sfnt_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 16280 bytes
SHA-256: f24eb7716daf3231b12d4a5b2b2c62932d8328752adee4b627eeefa4ee7783c1
font_02_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.