Malicious PDF — malware analysis report

Static analysis result for SHA-256 93470a897c8194fb…

MALICIOUS

PDF

85.8 KB Created: 2021-08-05 15:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f463b75c7313f57edd4968dbf2a871c SHA-1: 77a78ae93159263495696f122a62c8fe8650822e SHA-256: 93470a897c8194fb52cbdc96bda4fb96af1882d3b98aea1f8cc0a9d5ba2ba15f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing or to distribute further malware, aligning with the 'Pdf.Phishing.Trojan' detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a597aaa78836e3c55034215d033f20f0/66496593256.pdf
    • http://wuxihemei.com/ckfinder/userfiles/files/20210619_070510.pdf
    • https://hotellemaritime.com/hotel/upload/files/ruzumunojasanumilowime.pdf
    • http://appartenvue.net/appart/upload/images/nupigowoluxigitof.pdf
    • http://taxicityplus.ru/userfiles/file/13009193558.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ppv31asig8bic1v3a8rthb230a/pilorolulifeler.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609466af741c3---73179941332.pdf
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/74165813881.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085905dba235---padidusomibubonajof.pdf
    • https://luminex.pl/upload/file/sofekozowem.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a9609002---29494192188.pdf
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/47309563054.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/mudizakesepifegexokubera.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/86416843496.pdf
    • http://1-cities.com/blog_images/blog_/file/65553886725.pdf
    • http://amadpich.com/userfiles/file/fulufeteb.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mfsfarsfjf6jj8tslhfe9l15m2/xudazuv.pdf
    • http://didopack.com/files/81071334329.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f228a1752b---29094827461.pdf
    • http://dentalcenterstudio.it/userfiles/files/zedij.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/60uesnjbtc5mva1s69u6cj7kt5/70092172109.pdf
    • http://ristoranteyuri2.com/userfiles/file/48266123564.pdf
    • https://vandolderskb.com/images/usr/54658783498.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4cf981efe88a3088599483ba828b684/59599774852.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+happens+during+the+electrolysis+of+copper+sulphate+solution
    • 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_off0000e948.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 16792 bytes
font_01_sfnt_off0001015f.bin
fa4caf6a86158995f9f86656f55eda9ac6cbf9e29e9219ffe0cc6a23c7866b8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 11108 bytes
font_02_sfnt_off00011b0b.bin
70df65ea1680c174621ba49e4da45ef6f544bfbd0210d94bd4ead294b1c981c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 17288 bytes