Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fcb9d51129c0ea…

MALICIOUS

PDF

87.5 KB Created: 2021-07-23 03:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 772713dcf72cc5530a171cd4e736c146 SHA-1: fa09e60e4c95938a7536dc22cbc42c692db766ea SHA-256: 40fcb9d51129c0eab369522bd2b53de02643ad704d6e403673861c79ef9b482b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads. The primary purpose appears to be SEO manipulation or redirecting users to potentially harmful content.

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 https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/pbbf3kb3fj24clal0egskqfbcr/xajopujitevufirolabetugo.pdf In PDF document text
    • http://hkalc.com/userfiles/gulopo.pdfIn PDF document text
    • http://dgjst.com/upfile/file/89354395202.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/mamivobugekuwamir.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a8ac450517a3de25bf173b6ce7c728ca/96972015.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/88967276032.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/51363330913.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/45241906706.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0dec1cc0c70cb8bae6a54032374a4bec/50632168617.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/dijeludujejofeli.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/fasekobep.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/gimamewede.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2796e9411---kipite.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b54c28820e3---79355486232.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/pgohm86hfplepjit04lttn2nn6/79106695084.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/30917057946.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/50400751677.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/81uouu071r5mq2rbk9enf478e3/jejakumelerunufeni.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/xogifol.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/799mjhnfb3gut07ji7lhrb857e/96352676553.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/29f192bef84b73d8bd8aadc346571d63/491239567.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/pamegexowarenijetazev.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/58278325029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=happy+birthday+to+you+in+tagalogPDF 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_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 17768 bytes
SHA-256: 9a356c4cba76999476956fe86ff01d39f5f4dd437071abe6d8b4a1d21f39b529
font_01_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13814 10716 bytes
SHA-256: c30ad05906ea8a3e569490790ee9af63a5985f4c2b5ce9b86356128baf6ab26b

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