Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b53cf760904e83…

MALICIOUS

PDF

89.1 KB Created: 2021-09-05 09:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4350b24bbfd5d9352d8acc1845483b28 SHA-1: 2824abd7d8427d200f3810a1932151315439368f SHA-256: 70b53cf760904e83009cba32df7271dbc5388226d0fb83993620286494550cd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious content. ClamAV and ML classifiers strongly indicate this PDF is a phishing trojan, likely intended to trick users into downloading further malware or revealing sensitive information.

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 http://apexibd.com/uploads/fck_uploads/file/77468611157.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612b477d69b40---benukogawogutaxezowifawa.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/zejanus.pdfIn PDF document text
    • http://wenxuezj.com/images/File/52613753532.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/26555570084.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f0a0391fd---xurofaredeziraputipobigak.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/fegutatug.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608789e74b858---16382934272.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16113c5a8826e6---bitumesikewizatabadopuzok.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/deresewala.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/4197449837.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4aa4ca6b---zokonupoxuxosem.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0312388af---nabibabenenilivugezasuk.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa270f8ed---39152400259.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8b70a4613d18f2edd9ed1f896e7fa982/59960208528.pdfIn PDF document text
    • https://brod-plovdiv.com/images/tefexetasezisiro.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16079215097caf---tozepisomuvifalodosedi.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/rutojibezijusive.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074dbee0767f---vigumonelezulekoweb.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6467443f7a---sazukavunusoz.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210816084904398.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3575b7a0bf---45773296146.pdfIn PDF document text
    • http://dzbnf.com/upload/file///62332322398.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/89727790931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=aikido+technique+tome+2+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_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 10848 bytes
SHA-256: 7c8c5d262ffc5c975424c295e37ecf26f0d82cbd916c9cc026a5d0887b3ce7e5
font_01_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DE 17692 bytes
SHA-256: ec9787ea42c3fb125b3478ba5244720ca27a71a1be25b7f9e4827ef2d9b9da69