Malicious PDF — malware analysis report

Static analysis result for SHA-256 7774a7f782ac801c…

MALICIOUS

PDF

76.6 KB Created: 2021-08-29 00:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02bea92104ece276602227f63848248e SHA-1: f8b584e63d0ad342779e72b7039bc4cc310e8320 SHA-256: 7774a7f782ac801cfa619f735df3f1fc937071e5b8193b0f4017addbc4aa6295
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

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://chcial.ru/uplcv?utm_term=edgar+dale+cone+of+learning PDF link annotation
    • http://myucpb.net/userfiles/file/24758276148.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/raxofipivawuxerusos.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/cd4812885ff2edb1d3718f4e275ca19f/veletivez.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070107e22b6e---60836873498.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/vonigunumigarafev.pdfIn PDF document text
    • http://tillyardci.com/userfiles/file/bagoxevizelipibitupik.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/nofebegenaxuk.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b52b1c3f---temezejimubijijikexivuki.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/bn7045modobn0ulf9lb1vppalg/92059613111.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc78dc6cdcb---83302747006.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/17980901575.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/rawet.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/muletamut.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/28912626442.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/xatizagig.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/27141958211.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda9af7d967---lilonuxareveputorotisawi.pdfIn PDF document text
    • https://avflash.nl/upload/files/20924982082.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e633a1db380---remuxibujusojagipix.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ve000gvfb4bg4oummgl03eismm/senitoxewuxuri.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/84052557064.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/kizawagevoniridorelara.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/bozodowigoj.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/249487022449f656ea5012d0b73f03d4/37010646969.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 16948 bytes
SHA-256: 2098c38985b4761da1a7b2e7e65aa75221ec59eec32755ae1ba706ff20bd3f93
font_01_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 10368 bytes
SHA-256: 66324ad145f4884e9e5fa4443eb46b01dc2db319aa77e57f387284be0fef1d53

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