Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b7d37868ff3e1e…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 23:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97f62f0c0ac8affc698cd2578aa37d3c SHA-1: 0bd9974c0af6060cb89da1993f6bcc51f72e234d SHA-256: f7b7d37868ff3e1e289c0613a8130f3f02edea73f5ac7209da047d1ec80380e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of PDF link farm heuristics further supports this, indicating an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=redox+half+reactions+worksheet+with+answers PDF link annotation
    • http://laulumaja.fi/ckfinder/userfiles/files/92048589552.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/60025ce395658352dd0abcd97ebf467d/xisolude.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c512ccc82b3---firamudegijepulexarofope.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/899026a11d44028c0cdc5eeb0e961fae/29553175340.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/24427362956.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210718110424_9dwxyf.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/41697643862.pdfIn PDF document text
    • http://proxima-design.cz/files/file/62018243408.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/50275308789.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c73f5ca4a9---gigorujimesumuwadove.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wibokukeg.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/imqtfqhu5cf9d0uf1avu7anoq4/96543419053.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/xunogozetawazogu.pdfIn PDF document text
    • https://efnnma.org/files/file/18054236101.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b671ae1bb5---kolebuxodawodixotuj.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c21ab782c---tatotuzol.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/nugawabumilugul.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/dipat.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/libubamo.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/zilipe.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a0537da6412---95238834407.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16121a1106c597---deref.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_off0000bdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC6 16972 bytes
SHA-256: a91273b1b263ab16b4de0d05e472ed2a91eb19517fd4aeef4d14e6d0774bbd76
font_01_sfnt_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 10896 bytes
SHA-256: f015195192c192d07aa644fd4fe2c7fbf68507bf7f1fd7e54eeebfcfa44b6b10
font_02_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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