Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f90c12ee6873b5…

MALICIOUS

PDF

107.9 KB Created: 2021-08-11 23:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2756eb63905a9f9d6d5c1a8c5c02bc33 SHA-1: a66fb842e5ef774cf1caadd6ca1aebe409ee3d7b SHA-256: 39f90c12ee6873b53cc4ee189a9c3684a8a9067d16c8f3ba4e2b3d54471e19e2
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is part of a link farm hosted on compromised websites, likely serving as a lure for phishing or malware distribution. The presence of 'SE_PAYMENT_REDIRECT_LURE' and 'SE_PASSWORD_ARCHIVE_LURE' suggests a business email compromise or credential harvesting attempt. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d917932f514---nejekevifedekidiv.pdf In PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607592870d7e5---fusafesovogufolotipevo.pdfIn PDF document text
    • http://strandedtattoo.net/file/lodukudojizenozadilepoza.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/wereka.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/tupowotezazogiguxot.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/ipgpa2bi4ai410hps9trl7ri68/85908371589.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/kqpv9lbr57au13ipom2il2umgb/sirot.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rrohpo5776onhjmu3a03l0iud8/fibaminusikonozix.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe3f968ae---74999549909.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072221a8707a---44871608830.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45e641f2e---bobepugetagemisamuvipan.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/zitiwefenugasatudexip.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/88525367274.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/75562196916.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079c12da923e---nujanawume.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/cum67hv5pk56gifnc7fmv8ev0j/zawekajo.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/xarotojawedabonaderiv.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/zavipuzu.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/lekofixanobajegak.pdfIn PDF document text
    • https://aedwea.com/upload/foto/70191995247.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/wegulozejufigezanivuxi.pdfIn PDF document text
    • https://badoza.net/userfiles/file/70460983449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+activate+my+verizon+hotspotPDF 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_off000141b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B4 17616 bytes
SHA-256: 85de4b26e8f6aed767253038bc12430d3e0e593e5ac79bc645c6eeff6065d5c7
font_01_sfnt_off0001700b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1700B 10908 bytes
SHA-256: 35d9f809b513936a8238d21dc5b05e3c33dd16215413a9c69f2d432933cccf2e
font_02_sfnt_off00018934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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