Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6c07ebfa0ec6bc…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 17:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 841f510096604e9672318e348039332f SHA-1: 272d88b32173216b23ac886930394135af2f06fa SHA-256: 1e6c07ebfa0ec6bc7831756db8022d518b7a52b055d13b02101658d2da0637ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or hosting malicious content. While no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://stillwaiting.org/userfiles/file/sixekosire.pdf In PDF document text
    • http://alt-1c.ru/userfiles/file/27438419066.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/49522400387.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/kosebugakiwediborofipite.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/vusanuva.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/52582907890.pdfIn PDF document text
    • https://kueapem.com/contents/files/jobotugetemematimobuw.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/bazekegabisavixopa.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fbb54703a---mozubabawixowodiwe.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/dapubemesinikaten.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088da8dba4e2---90415062900.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/fuwenipexiwimazavumopazow.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/8904447c73a5260b5b0e7e9958956580/wusorifukivejanes.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dgr3m2plmh03jtug0oqje5gu4l/35487966379.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/90759268678.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/4ab93a5464db97ecaeb832492b6c6681/23531590612.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/78436080036.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/77484777717.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160751670dca5d---54191241992.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f32b74d0f7---bixuketeliruvipofetuz.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/gemulivowujukanubuwob.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160acde6a553ae---72639666855.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/93101828557.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/zimuvuwalafawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=5th+grade+math+coordinate+grid+worksheetsPDF 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_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 10988 bytes
SHA-256: 15af5fdae817738580268f651c559c95b3ab29224b9c7d876943111d71a88a00
font_01_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 17984 bytes
SHA-256: 3a19a1c3f6c2f6ae2bc95fc25afb5aafcc9f6c3ea767d1985edff799a8f77f72
font_02_sfnt_off00012aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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