Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff1b6e579dfeb9c…

MALICIOUS

PDF

172.2 KB Created: 2021-09-06 11:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 552531315664a91017ff40816ad84acd SHA-1: b313e9780a20f87b25521beffab994e863e43076 SHA-256: 5ff1b6e579dfeb9c9d6f37b611a21eee659742b74fde436cf42979df6a7f983b
154 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating it contains malicious content. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8785

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 http://cn-junsheng.com/upload/file///202161193638711.pdf In PDF document text
    • https://churchboys.org/userfiles/files/5817517862.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c023a7112---sofigafexofeb.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9272cadf17---71269177434.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/rabafiwagelexepukilukora.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/11234981657.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db100d4b999---wimufamidisewa.pdfIn PDF document text
    • http://cy2hand.com/userfiles/bosuweluburofuvetojupika.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2f1453de8c0453fa1583ee2a62a1fa00/jezilabubilevodazad.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/69662278014.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210806095235.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ulk60stbt1oj22cs85b5vigfo5/13382910613.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/kelunijawuxufemiv.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/fd5e51269c480fb8865e1811d273e425/lefodanajakozi.pdfIn PDF document text
    • http://precisao.org/files/files/4612699933.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/75679771120.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072505534773499.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/0eb8259ce2ed65a9cc0059d97f7125a2/33442308683.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/4442630072.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c741d310fb1---rumebex.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/renufumuxele.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/jidizewiwelipokoninid.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b556ed8a356---3400068706.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e973f232b00---vuvetujazarigogileg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cr+laurence+catalog+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000289f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x289F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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