Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa28ffbf94a7a8b8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 13:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97f2bc38ad7be1bb0ee8461d640fe6e3 SHA-1: 7dd6304806acda7a19eb60f3f3a5c500aa39c997 SHA-256: fa28ffbf94a7a8b87bf178ca205a2f71ae3582e941c3ed9ccc5c1991a938c859
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/682e938774787a3ebea54d9bfb3fc3e3/laxiximutifi.pdf In PDF document text
    • http://www.lircai.com/web/inline/file/18265926203.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/32970723180.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/gusedanujenuvu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf395a695a---xokubobawu.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/nimexelofikirut.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uq4tfgu4g9a33j5dncb4aia2ft/1313226071.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072992897659---tuvijobafepolelalovomiwu.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/denoxigetuderosedusofuzob.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/vapodurudowunagezepula.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e409ae588e132aff082e491df9762bf4/83726064507.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/lazata.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/puwekisetaka.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/0ea36c928fdffb7e523987a1482dc1f3/tijoxix.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/q9la67qcbue7sopoake7sj2d3n/10099231403.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/68176934117.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56778f7dc---ratofubufur.pdfIn PDF document text
    • http://chinalabware.net/d/files/88674920496.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84665fe09---poxexuxosow.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/gutubonugiwonarijimivaj.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/32341316006.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05e766e49---52268154129.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/tizejiwuwikif.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/577s818poubv6lnqj9geja7729/kogomoxasora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=henryk+sienkiewicz+sachem+pdfPDF 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_off0000d21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21C 17680 bytes
SHA-256: 9dae6888513e60ef04b0a914f3b7998e7442cddb66484f4a798d848a23771429
font_01_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 10964 bytes
SHA-256: c63eb3f17f681d026392207e606d8e4d2100ae3d7b00b4780251b2e035146237
font_02_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1