Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd9e304fe450ee4…

MALICIOUS

PDF

78.4 KB Created: 2021-07-15 10:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b298222b32569d7076d1135ae2b0b6ef SHA-1: 89095c4e683b502b3d7042aed6c76d6b58fb9352 SHA-256: 0fd9e304fe450ee419529c616befe112e1f29acfcafbcc9c4dbe1dedf1368c97
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e0672c143---dufurazoxupuvaven.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080969ec8cf1---78133697127.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/29649012920.pdf
    • https://pharmnet.cz/ckfiles/files/files/50534126760.pdf
    • https://dhesient.com/media/tibotivomojazafemopijorig.pdf
    • http://partnerplus30.ru/images/fornews/files/56276091932.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a192a5dd5---guzujamalugo.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/74777038927.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaed526404---71644910220.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085255861d98---satoxagamujizatukoti.pdf
    • http://iseveranscopy.com/upload/editor/file/libuvilodovazimizolixu.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd77cc2131---4154157434.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ejbkk4vcnegnmm4j9gnaijmeoo/60548861350.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/2c502002d485a7b96c3403cf29a973a3/kegapewevoboxotubunole.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/mpth4geunm3glnmeonvhp0fhoi/85574621051.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0860477c76---5241725406.pdf
    • http://tutek.eu/userfiles/file/75410413926.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16077a98340288---63526942851.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2463544839---87786409596.pdf
    • http://nextgenship.net/upload/file/20210622162437080427.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/s5q46tg71fcloeeaculrd11lpq/18435902470.pdf
    • http://mwflower.com/upimagesfile///6646398896.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f345d8c7a2---30018173691.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pharmaceutical+microbiology+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf1.bin
0a79f12f8c62fe1ed31dc636e1c5966dd6b8eee6c9e1cef4fdba0d7f7e91a2e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF1 11340 bytes
font_01_sfnt_off0000e813.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 16792 bytes
font_02_sfnt_off00010025.bin
a5a510924a342ec7a5d403dd815ab402b90b106c16b2cd4f01cb5f799c62c48a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 17068 bytes