Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce467fc176a4cc8…

MALICIOUS

PDF

73.5 KB Created: 2021-06-14 08:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67ae7b454ea3742915ff1c856ffb15a6 SHA-1: 5281fa1ad00927b5c1c43cb8524c20fd2d20f97b SHA-256: fce467fc176a4cc8ad8a0137458e0ce53c7ae4a90ad53f6b209cd7ad7e03f9e4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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 https://nomylo.ru/uplcv?utm_term=tcode+for+customer+master
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/8123116882.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3b7076c0---gebejomugasojesoranuporo.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/1bc2f978eb1fd48cc331ff3c30a5fccf/jenugu.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/frkaba1fettuc52rfb7u7c620c/regigewumizirigemukojibez.pdf
    • https://bigpointpin.com/calisma2/files/uploads/judewabapijejiwu.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa5c3ea45a---65338368772.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ed4675d2d1ab1fe8960721cf4c738f58/niputusozutoropuwadusopo.pdf
    • http://lideparts.com/userfiles/file/1620905545.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/rg52m5qjs4q1tqdn9bkd6r7pa0/89800190623.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/8885d1da27d7ec6cb9bbe8399a6d434a/72360488718.pdf
    • http://fixafilm.se/userfiles/file/82047404344.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607979e758abd---70404859207.pdf
    • http://omak1968.com/clients/71178/File/xexufujavasasolovufa.pdf
    • http://tahi.hu/ckfinder/userfiles/files/28815949992.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7e5453c9---1245085076.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df20.bin
a61f33ce57d041612b4b3bdc4e3b9ab6db6c98d972ff432c315751c6340e3b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 4812 bytes
font_01_sfnt_off0000ef6d.bin
61b295209911ee1b8c44e31303eb583de7d6fc6a4a8dde35181c2eb65c44fa22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 11416 bytes
font_02_sfnt_off0001164e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1164E 4324 bytes

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