Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5a52d263a006f6…

MALICIOUS

PDF

88.4 KB Created: 2021-09-04 20:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d59514f71436091718fe9a9be5af6bc SHA-1: f36b6d222dadcc73f816c28682c7f62eb88ac0a5 SHA-256: ec5a52d263a006f6bd10188da1620e67fc39900fe6d0493541a44cac6e264bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://coral-travel66.ru/admin/ckfinder/userfiles/files/1656500345.pdf In PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f490b7c7e---jivovazapexu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818e7f14aee---telewoguvakexaf.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/mexafejiduxapeludode.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722de796615---67996739554.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42937f003ed41cfd102370976ee7e2bf/70626632706.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ba9053d74447784b239a92f05fdcf7f9/xovexivaleduponikumem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2abd815a---jitesijolalupi.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/mijopibosakodiriguxal.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/5802581642.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/20653743037.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/5ed6afce35808c9b6df4051137b66709/tudosatovugejex.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160842d48142fb---832169379.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/gebatuximelaripepanu.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/089d8d43143a3e421b2d8ba7f02b06c6/nuxarepifidetovijijex.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/a9pjor74nbbf4b0jqapktr96ma/bupekosusemiwubuxu.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/90263490636.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/bifipeki.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607022ae6dc0b---favanidarozozinagozix.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/7431569264.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/45505900245.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7a7caf7529fa6e307c710edc564dfea8/32595777108.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/68798313847.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/12448498963.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982dbd6398b---rijapuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=auditor+general+report+2019+ghana+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_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 17880 bytes
SHA-256: aa91b7d9a49a1e9b84fabec684dc8993f2b74934ececa8901990868d613a6538
font_01_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 11152 bytes
SHA-256: d48e32e7fb7e8a85e9047bfecbd08807d0869b2f5b47ca8883fdcc9717e7dd4f
font_02_sfnt_off00013b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1