Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca76fd90125bf6e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 04:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3094408c12924285a573a407653ac780 SHA-1: 463ef45fb89cf1b8d225cc2744080d260cee0724 SHA-256: fca76fd90125bf6e98b9f6fd43518bdf0f49d940996a6927eae52858de450726
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to websites hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9724a300e42281a2e6fcc65d6a742949/xunaxunijafipuvo.pdf In PDF document text
    • http://www.grifin.sk/files/wulijajobibodetitalojoxu.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/40568834699.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/98235689684.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/pefubesodewilube.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1ee475c330f34e715678584a52001098/17105316880.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c00bb267ae---jifamumegukebov.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/nimofajarepapuxeposur.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/relomozerubuwipatesar.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07854ec61b---rozumevalukosapepovumi.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9de55a110510c035e92a129f439170e4/9505486489.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab8796bb0---botiruxovebimibimov.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/ratopuwoxonag.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16120b126141c4---jiwelekenuxubebure.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/xuruvatipadov.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ua3psd9p6mvjaet00stj0u35h1/bajoluzoxuwazoturel.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/49143435776.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/gawexe.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f350d9cf939d19a00cdc102a97210d58/6029663691.pdfIn PDF document text
    • http://billsky.ee/files/file/18487976038.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d6983ffb---rikesonunateg.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c106ab437a7---xewuwokededuxi.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/suziponilamudam.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/zujakuniwefalub.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/xupupimataveraruk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=alimentos+alcalinos+contra+el+cancer+pdfPDF 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_off0000c121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 16596 bytes
SHA-256: 2aea17ff732e4042d1dcd34ace6c83b3ed37fb315e9b79dc77e3be08af427c94
font_02_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 10760 bytes
SHA-256: a19c2a097f594cc1ec71621af5a403f74ca3ee7a9d2457700d1a0bd31e577fce