Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9a2f42dd7bc447…

MALICIOUS

PDF

94.1 KB Created: 2021-06-28 05:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20204dffeac2c0e342887d26e52797a9 SHA-1: 34b887faf67f94b0e94a6a77a0a53dc3de373ac1 SHA-256: 7b9a2f42dd7bc4479a568a4068b73c12d647c2c57d41f7a01952d8cb835db830
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/7db1138c917234b85034a287a9954f27/zazusexelaxunidejarixu.pdf In PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/ba2cb09090209d24fc82e0520c3c8b25/83682605715.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/99b4972812fc54ab66e92dbbaf59890d/60647491871.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160920d966bf3e---vevefiz.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b3054fb761c08817b2405e681e0512e/resakovivesuvuboriwidoju.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ae32e4b1ba7---83086620454.pdfIn PDF document text
    • http://roocenter.ru/upload/file/fanil.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/ac310db2a1a156d09b0d39e7cde6851b/gexorumunovipefugizizide.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc94fa8ec2---5858622230.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/34576950371.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/85230500551.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e00d0631b0---42303381568.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a096245e---14111141368.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e1ae717441528f615854633525d89081/josobebi.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/83257601545.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210613151818.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079f4f2531ea---54282597329.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aec9d2f29d9---89557579826.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9duhj8il6n6pfvjmuosun8nsjf/zobodaxabirusorobiwib.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8563e2b31ced498e57580296658256ca/dumemajun.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce10b30aa8d---20988454058.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6dbb57a73db8d0e044170a3a22ee2c9/keletovozosa.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/wevevekowidewexalisufamox.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/30598313605.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/79a9bda6d49643955d0e00702f55d3e4/47653330263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=definition+of+exigencePDF 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_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 10140 bytes
SHA-256: 2ba932964e08691c5128b8b96bca4ff9681e6b53204ae68f831263e3148f1112
font_01_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 17828 bytes
SHA-256: 2d800f178e26fca11e9f23ebd36424b3d24483aecffcfd17f39a5019f7db3b6a
font_02_sfnt_off0001530e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1