Malicious PDF — malware analysis report

Static analysis result for SHA-256 036fc75ad5bb8b3a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 13:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5cda549823f5077e489f885fefe35b3 SHA-1: 8c529d6c2964ba1390fab63639e4953cac2b4f4e SHA-256: 036fc75ad5bb8b3af2946b9e8bf1877310bf4ee5b418fe0a5aba90703f4c1629
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=ecg+interpretation+made+incredibly+easy+pdf+free+download PDF link annotation
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/4e5906cfca4252f15268cf344b4d947c/najoxotiw.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/bumojezaxebapadinasofawed.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/484d1e8a8cb4bc6f497b62c1eba3c998/getijamuvinun.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/o0eav8pch13hl826f78cm6onh0/tetenekexixitofikuxajunet.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/sikamuripujuz.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/jevusiviwatiziwopogili.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a497ce78de2---pabinobilofude.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/wudimefufubozekovar.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f62bdebc2---xabugudajanagupemoner.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9f2dbc09cf39dc5bbd8243d546f4c121/bipulenejedidajilefu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/25d3315cb55cb08d251b4a701ea69e8a/xikumizetevew.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/dikuxijo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/c393mjub4dchudqhuj5o9peqn0/46388675920.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608120fe7dcd6---jebew.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/jefatanavamugukozoluf.pdfIn PDF document text
    • http://canvangdientu.com/images/file/38091397400.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a119846f022---dapufejuxexola.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610443f57a638---zeloxefofotepolifesaweba.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/a8896jd9r331ut3fir61h5n92i/tikopibunakixukupuwiz.pdfIn PDF document text
    • https://mimpidia.com/contents//files/11021935116.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/sawavineriwowuxav.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/nav9dm1ucfic51qd560jgb4htp/vokuxagutejevevamuvuf.pdfIn PDF document text
    • http://harlit.com/upfiles/file/54904683094In 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_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 17872 bytes
SHA-256: 5b99236c983ab516f22953b35bb1e417c79eba4119021dcf4d85693179fea4bf
font_01_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 11284 bytes
SHA-256: 90782a71f303188f8cce552b5ae434a8b2e0db9cfc0474cc06f78181ac64e162
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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