Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bc25d9b8c72fde…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 11:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 513aa627d550a9721d55d5f828ffd16b SHA-1: 1a3f731d777fa68c77c815212660b45063504081 SHA-256: a4bc25d9b8c72fdea830c9c45cf3efd7aaf9ff427579b71f79aa2b3361614a50
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable domains. These links are likely intended to lure users into downloading further malicious content or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://hyundainhapkhau.net/upload/files/mobigomunifuja.pdf In PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/7cbtkjru29te3etc7tu6dp138n/bivowox.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/37k6oobb30ja4bbu659i7n57lq/vibagawa.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/29294593820.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/muzewilamufokojibi.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/befikifivuxunafav.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/25315700328.pdfIn PDF document text
    • https://proxus.nl/file/29365783370.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6c4729c8b---3551899202.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/tesawulew.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d214629e2---vuvamarilerajizixadosi.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/bokusuxifob.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4565f70dd5eeca9d98a77f223328af32/kagimoda.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ujnb18crbjh59o4bmc6teo3rmr/paxamadegofedefudosama.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a75294877f---426390035.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/malerodujo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c067114b32f0ccc2a20c017beb4acf6a/fenuri.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a168d5c9f60---rejasiridubonabulenorapub.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/nefawugorize.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/16749947320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=water+purification+research+paper+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 10764 bytes
SHA-256: b0a17ba6326cf3c5479d4694b80ab793e5b15adaa572b3f4d32a0c4813ad754c
font_02_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 17732 bytes
SHA-256: d0dab6f86e043120a0572bcd9771f5640a33c6836cc7232f6415b99eba91a11f

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