Malicious PDF — malware analysis report

Static analysis result for SHA-256 c909e6c0a475ad18…

MALICIOUS

PDF

74.0 KB Created: 2021-08-31 11:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11730e8eec1228638f3f98ad50864b57 SHA-1: 9a5967bd705bfac5e053728176cf1df85eec0627 SHA-256: c909e6c0a475ad18b000fa9e2d1e61929ecf2811b8430a3dd933375ec27511fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or initiating further infection stages. The presence of a link farm pointing to multiple compromised WordPress sites suggests an attempt to distribute malicious files or redirect users to phishing sites. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f4fd4a17a---manidajimolanivid.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2198832974---18901969291.pdf
    • http://faradbox.pl/files/file/tirobejaxumutilifafig.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b102d17d18---laxapudimixowixore.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1611058eb8aef3---94117417842.pdf
    • http://www.vikingmaterials.com/img/31885191069.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/g9il70rp9g61s8b328re6dfu87/93398085531.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/quplj19thikms6edbj3lka0isb/52184993135.pdf
    • https://sanaspinler.com/calisma2/files/uploads/vewapebufugiziwoj.pdf
    • http://kutscher-customs.de/gfx/userfiles/files/burilekewaxumojuxemo.pdf
    • http://tsrmmessina.it/userfiles/files/52845435918.pdf
    • http://shyjjc.com/v15/Upload/file/20218292051266685.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba207ce35---9450295403.pdf
    • https://aarhuskortet.dk/images/file/rodamefofadoxotomefube.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3b7036ab8dae34bac51981634f4c0e62/ruxok.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777101aaa2b---91927028625.pdf
    • http://pazzo.jp/js/upload/files/4636411200.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e5ff1475a---94178696070.pdf
    • http://inspiredindianfoundation.org/uploads/44869707685.pdf
    • https://chp-travel.ir/data/file/jifesijafozijuzalaw.pdf
    • http://buren-kompanie.de/userfiles/files/20319081855.pdf
    • http://superplasticizer.cn/d/files/makisutofowuxamus.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827201e7099---98744342709.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/468a7ca90216a0313ccd3f482208cd2c/tijavimifexeliduzofeba.pdf
    • http://fairway.cc/images/blog//file/xizagagovelidokazofur.pdf
    • http://kolbiko.com/images/uploads/file/21764330246.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=diet+to+control+hair+fall+and+dandruff
    • 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_off0000c254.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC254 16792 bytes
font_01_sfnt_off0000da66.bin
5c4996e1166eec41aef931098231a569440b413fec4a02745229da96adcd1129
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 15524 bytes
font_02_sfnt_off00010190.bin
146884c29c8c11dde431dee9c93e0e342c988f0d8b8bb0df9561e7aa5e0ad134
pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 10508 bytes