Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9942573fc26a73…

MALICIOUS

PDF

88.5 KB Created: 2021-08-07 23:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b117dd79ae532763cc30c66f5945c167 SHA-1: a663cfff8081ce9c009dda51a6fddedef6b08791 SHA-256: 1d9942573fc26a73f9f581914bbafaf253f71e7aaf1dbf60e8ef1b024373b3ea
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to numerous websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://fandimnarodaku.cz/upload/file/29538680735.pdf In PDF document text
    • https://agrimal.pl/userfiles/file/ronus.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7a8fcfu7t42uvatqrcp3t6qiah/zexubiroledofa.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/7871634838.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f54e7f14db2---liduru.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/sabufibenulegakabik.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba35dad3cd9---63497564291.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/m7r2658bcu8pnaepr2gvk3ombn/8235567126.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/gupidilerow.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/69720427827.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/47991599818.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5fd53176---59898689026.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/h8suf5knqfso893v3126uhtgc0/4765611086.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/getunakunoturuvop.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/pudemimewilugajujotuwiv.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/92822485198.pdfIn PDF document text
    • https://southafricapools.com/contents//files/82159075909.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f9dd807c8849fa90bb34eb2965257d3a/33950367882.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/18954495331.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9103a813---69051021526.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/66674083983.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f43a2483b53---fidog.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/penajojowefugokubuseti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+size+cannondale+road+bike+do+i+needPDF 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_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 16924 bytes
SHA-256: de4adbea34669f3891fc7940e29640aaef070a6c148656db3ed574c9cca59261
font_01_sfnt_off00012397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12397 10752 bytes
SHA-256: 6861db8904e7eb3caa1f313995368d3d9efa6aac1739c52e3104b6300489c153
font_02_sfnt_off00013c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1