Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ebb3f263483e97…

MALICIOUS

PDF

101.0 KB Created: 2021-07-08 11:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed8e7b01ef531ec3abdf8ffcb3721503 SHA-1: ce8526f148cd9dbbc7a0ddb28d73edbefa5ae373 SHA-256: 72ebb3f263483e97545dcd98b3789d933816009b131a6eb102462fde66557668
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised websites, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into clicking malicious links, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://huntic.ru/uplcv?utm_term=multiplication+property+of+equality+meaning PDF link annotation
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160782d20f3b37---57349859019.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xutofegumizefotato.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1909e9386646183d6d55ca88369e623f/lajesamolakin.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/28734928208.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/30274527208.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34ba04f74---19360341211.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/56048e7e8488641f37d93c3352552d97/42301220339.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab394a82600---78829053693.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093e77f954d7---rivube.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074353a4174f---mamoguposigebare.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4c7ad9054---wiwinifuwugubizajo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a2fcb711ec8f408faf060f507426ef07/pafixumufar.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/19b13f6bcbfd8e409448e7dc4abce8f0/fogopewago.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5f78afa4d---14541474883.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/deporevevefukilonabefubi.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/wesomibim.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b31bff58d3a---58195919243.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4caea849---lijadibez.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/bukevopipakab.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e517b8819---vakiluninopafupoki.pdfIn PDF document text
    • https://12tiga.com/contents//files/22604137593.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160811151eac71---pilususib.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/76vjkutqe2ugj3kefm0e4vsc56/vubafulodubikon.pdfIn PDF document text
    • 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
stream_004_off0001516d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1516D 18324 bytes
SHA-256: 54a14e179e71866c2bddd18eed525b40a4784dc0b5abdd1ec350f6f83cf87b2a
font_00_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 11008 bytes
SHA-256: df2db9931d27e3a940cceaedd0f5682cf0411f02601a0aa4a4103b16abc9b1da
font_01_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 18684 bytes
SHA-256: 41b709e3d079be017ccde42a365da9a6bcb1e9527e90d0e1068f355bd23b90ea
font_03_sfnt_off00016dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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