Malicious PDF — malware analysis report

Static analysis result for SHA-256 22654c5763a3f9ff…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 16:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5e876172e4604494f6738d20762b95b SHA-1: 0a464d9949bf3e7598a2f862087c6f571a09e960 SHA-256: 22654c5763a3f9ff6421f1b66c7f9bb58dd329b6789b5963c72485ab2bbd9459
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of multiple unknown URLs associated with compromised CMS uploads strongly suggests a phishing or malware distribution campaign.

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://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d23ec6b0---22056276007.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2b56ac898b2e9dede6781e596f5f312/30221377225.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/niwogemobanuzofer.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac6d659303---pewenoxawajitub.pdfIn PDF document text
    • http://voijin.com/userfiles/files/sasofurosibunoleredo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0afb43b08---fivorotubikipam.pdfIn PDF document text
    • https://unosms.us/userfiles/file/welanixelen.pdfIn PDF document text
    • http://smakbyala.com/ckfinder/userfiles/files/99841166924.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/1fb9edf0i6o67kk41lfqisvav2/fipevow.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/bolijo.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/wepuwilutajil.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766608e378c---vapax.pdfIn PDF document text
    • http://linza-market.ru/upload/files/pulufi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1efcea74f---58051869954.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3fe75ba54---sazudufajebudurod.pdfIn PDF document text
    • https://goldenapp.net/file/74201930292.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/fomavalusobafe.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/rakaz.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/gawavusozu.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/81058832941.pdfIn PDF document text
    • https://tonitomov.com/picture/file/salodoxekatabipa.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/tqu1c6rncesmvb77m4id6jslh9/vifutatuvurinuzipigorovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=20+by+20+multiplication+chartPDF 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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 10840 bytes
SHA-256: d2a9dfe4feb2a309fb8e40b5481bde7ec1e0d226aa34d12fa8016dbfe971138c
font_02_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 17968 bytes
SHA-256: 3275fea7c0d5a2f6e8e73ee8a80db106f0482e3abe88ca76daed160e4f8befe8

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