Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5243d8bc2fa9e5b…

MALICIOUS

PDF

72.7 KB Created: 2021-08-25 20:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4a9cb61e16f06747402548c5f499298d SHA-1: 271d46442ed66f768b2165e7fdc91222f91516d4 SHA-256: a5243d8bc2fa9e5b90ea9f6aa288f2bcccb5ae91baa3b1c071ea73d519704f33
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • 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.
  • 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 https://wastran.ru/uplcv?utm_term=plant+cell+flip+book+answer+key PDF link annotation
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/00ba3a33c92df16a16db2938cd0bb49a/xanesunutaregujubepevoda.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e69d2c811f4ef078e45f8baf6e0e5ea3/lamidixezijasutafan.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/vumoxomuroj.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/6da965ca26da660fdb4abdae201e44fe/57803443020.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/21832368179.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb27da92fde---38528288252.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/98518590228.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854e321f2b3---rilonasowutizebexe.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d1794a8b---xoxagirafibopiliji.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/49918304265.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/18568013256.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/gomonejarezoroz.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/1508352f8996ff220f1799d017ac5aa4/bebunowaben.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160949df7b90c3---jozobogemalajokinibuf.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/43667421105.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/zifosonofovazitinare.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/898da571cfffc32c47de9933eb603455/felijejesodiloxonu.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/87001294130.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/33432389860.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/xininexosubakokuzeboxe.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/84861dab13e538b38d9e27ba8af7e488/pulunolatejosid.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/2458908413.pdfIn PDF document text
    • https://codecs.ro/images/file/titetutixaxo.pdfIn PDF document text
    • http://deauville.ru/files/file/goxoxudupi.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/47236576727.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/jugagef.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_off0000bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 15380 bytes
SHA-256: 6207990a6a1a86344dcd954a78d61a29389a5d3c5210d8d3f9e8647c06f15030
font_01_sfnt_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 10904 bytes
SHA-256: 411c3ba5dea71fd402477aff982ea72255dc0afeda4932e44b8eead3d5b440a4

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