Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3f202d293a2229…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 05:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d5c407c59a66de12069a89a96ccde1a SHA-1: 05b68d92db404fdaccdb6b2e603085e569ac26d0 SHA-256: 4c3f202d293a222913fea9bf10601db1a9f5667b93857b0c6b83f3f518cdf013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristic firings strongly suggest an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://krisoc.ru/uplcv?utm_term=cytoplasmic+male+sterility+pdf PDF link annotation
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/tizisejuzeni.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160759b87988bc---38836130181.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1a38e7a8a7095933689d2c738010b646/gufinuwolik.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ur3aitvuf7i5f807lskpoft2b0/51937697275.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/37878777916.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada80ec9ab3---41966028068.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/dumemexukanimerap.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/nelinilavesawi.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zutugi.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5972e2a660a9ea63034af61f5ffdd46/reralivupotapufuzomuzafu.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/patipaxatefir.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f3885cc0cd3---64191602857.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073650753e6f---20857521117.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/50892398420.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/8cc46c61f3116f6f50b7074d911e44b1/77240199986.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c45f8fa15---89553053288.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/60kg9v9284so5gustsrl8m86d4/xelerinuper.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24f17b5e3c---81727472262.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/87612844308.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/51t9oc2vfk33pkongm4a7s559v/66597010399.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/rugef.pdfIn PDF document text
    • http://petrduchek.com/files/xujawubopipujasir.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/tukadaxikimalopazasuj.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_off0000c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48A 16900 bytes
SHA-256: cc257995d2e809def23e5c50cb5419a83e98206d1ae10b9bce842ff85518c1a5
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10820 bytes
SHA-256: 71f1fe35f7b44f26ee810ad501a78d53875032604ff4e7ecbf44e93a1c00f994
font_02_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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