Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1137555d6b4c13b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-07 06:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b48d8ca8e6aa529f56a456f80b8c15e7 SHA-1: 6f8a42cecf8841938142f3a17f4244de82542631 SHA-256: a1137555d6b4c13b733e53302839f57df83afbf47b26fca48713698a846bbfec
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites and IP addresses, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely leveraging a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160cc37de44f4e---porejorodurazozekinumo.pdf PDF link annotation
    • http://supermarketdv.ru/files/file/93986920680.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210607_9DCD5F992DDF9534.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles//file/60716731901.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120b7202afd8---17404741715.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210816_073559.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/52105863139.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/pareboki.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/90263432676.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf139fa882a---38758095270.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/61415556218.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/5034619257.pdfIn PDF document text
    • http://hflchw.com/upload/file/rubapexusas.pdfIn PDF document text
    • https://anjingliar.com/contents//files/24992065324.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/709a253a126e5cc9aab4b29618136975/jawiwugagojuzo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612703a11fa15---50491572655.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/dozinu.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/jegutagamejux.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd722339504---68912728753.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/rirarifizodijagora.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/75113631008.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/gufexusasimuwufufotefede.pdfIn PDF document text
    • https://conrays.ru/f/data/87558581887.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/97344352148.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/zuwonaberezinogebidaxaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kaplan+ielts+practice+tests+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 16836 bytes
SHA-256: 645820c595d4038498db028c8b5d80835908cfe6b43d33359db03e6d05944cee
font_02_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 18568 bytes
SHA-256: ab7871620aac40d030f947b4ed53916dd33d4661f94f7a6c2b792f23a6f1357a
font_03_sfnt_off000134d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D7 10484 bytes
SHA-256: 0af05d2e71909a9875b00c4ed1dd07615dfa4f066e499581a097e3f8b015e8c0

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