Malicious PDF — malware analysis report

Static analysis result for SHA-256 64445de8fe30e4c8…

MALICIOUS

PDF

95.8 KB Created: 2021-07-05 09:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 257701963e9602d5f68f9756ccd362c2 SHA-1: 938aa4921a6241c18a9f42a49babe050c384d3fe SHA-256: 64445de8fe30e4c8a5c12669854b967b7174056a8ea12b670c5cbb8a96481ccd
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, although no specific scripts were extracted to detail the exact payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afee69a16e5---lizipogeteguxapizuruz.pdf In PDF document text
    • http://castrolmintabolt.hu/images/upload/file/54026541027.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/surisofopofozomolujit.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ae5n2kb095og92gphrrci1p8u7/vizakulaxa.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc58f98851d---50802494498.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/xozoxopumukusin.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/89198351651.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7bb2c622---fixawugapotopovofegawo.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f8724539624442f84eb89cb94bc245f1/jesig.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/q0fn644r3io3pbto8757vlpdo5/51670613092.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608efcc761a30---dezasa.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/84018237011.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608784f486615---pigix.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/94023934194.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/6945575662.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/jazonoluwidepujuji.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3384ab162d---jazajumavijakosisefobatu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/03be399adcbbf1782d1a600f83be2fc6/refonaliwozoxelomapo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a8179d76---vatabelaritaveworu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/ddeb1e123b967a26907b06bc1aa7697f/kimenezunavuri.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/mujoko.pdfIn PDF document text
    • http://www.centralperdana.com/file/kebitesaru.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ded1792b51dd6f0cb4c711345f71ee65/27832679337.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/jovizelemodoleluji.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a77e8ad87d0---bepufitukut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+draw+a+minecraft+wither+bossPDF link annotation
    • http://irodori.kir.jp/files/file/24516035444.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_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 10912 bytes
SHA-256: 662c4f8e379556ccdfe91d3626ba65d1850b51777d8d1897cd1a79a81c5b7f60
font_01_sfnt_off00012aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAE 17796 bytes
SHA-256: 482b74f0c20436ebbd364e7a78e584953d13a68c65c2bc6c0d62312101838aea
font_02_sfnt_off0001597f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1597F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1