Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6e7d8b7d0b3ef5…

MALICIOUS

PDF

104.1 KB Created: 2021-08-03 10:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 297018785edbf684f00d142b748f21c1 SHA-1: 3a80f3aff38148b80170c4f7b67e4101943266d7 SHA-256: 5b6e7d8b7d0b3ef5b4b1dcdebc4f63505d7e7ace8c28354c64e8b040432704ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to websites that appear to be compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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
  • 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://shqinze.net/admin/upimg/file///daxajiduzixitemixaz.pdf In PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/01b750f05ee7c48c5b0cc1d4d752ea3b/fenobelimowuzerivexegako.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/4b72a380dcae5f308c229d9e2e66f742/jowudijala.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea639f05cf---pofovemizewo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace3b0ed02---javeruferezepivuto.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/wipalemerojevipupiv.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4a65c33877df2756442147f6bb54dacb/nuwurefixupodakogunix.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/zutezik.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/210d824d99349f12d70a51d0a7255fdb/71134772122.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/9c33e6bbf04f9a87b70657bf9ece34f1/disimogonunibojivulidi.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/94103804417.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/c0k60017vhoctii2k3i1pqc1ik/71823761542.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210515070612.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/35412d8f6e5f6871e0c8b11e9da38c7e/96186657263.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac048baf7d5---pasokatugofibofovox.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084242e44983---vaforukeba.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/95715828788.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/nolipekuretopelovofik.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/58448679495.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/radinufototodurufavitepi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf8784dd1---xarogozejikunufapogixig.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/6492b4c740cee1e0a4764ca5495100eb/xuniresavabowerotixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=oh+brother+somebody+gonna+kiss+the+donkey+meaningPDF 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_off00013108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13108 18388 bytes
SHA-256: 3716ccab9db8eb6befc5cea579b53bf4df40e88ef501a3b9e1dcf6156c7f2e98
font_01_sfnt_off00016056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16056 11020 bytes
SHA-256: 6c97e75489f6a6bc9be6ea8ea4b588ebf63aa09d8fd25a7decd72741bb6a77b1
font_02_sfnt_off000179a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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