Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c46d5777258233c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 14:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c5407756aa7e400d97175c0661b3f86 SHA-1: 4c340bddda65d86ee788ffd74ccd44d4f684e91e SHA-256: 8c46d5777258233c1bf0f1f2807ea8ee10eb0fb368b71d4d2e7ed7b41f74555c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm pointing to compromised WordPress upload storage. The 'SE_CALLBACK_LURE' heuristic specifically identifies the document's intent to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were directly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.
  • 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.
  • 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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bed50dc37---tufekobekuboku.pdf In PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7873517c91---jevuxirozikoxi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/84771436771.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/mukasenepuzuwalujag.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/mukajizigonapamijefegif.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/revaw.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f091d1c327---xutudoputagowofabisepuxa.pdfIn PDF document text
    • http://licausi.it/userfiles/files/jubep.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/tinokebavivitaj.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zikizasafosatu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091ab2b45a8a---sanenulupe.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/zavamosejepukufiri.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b597d378e1---74375192965.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/70898222034.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106ff64f0bb7---66327895308.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160977ad2c43f2---fesuxuwaritilerisin.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/vaxetegizi.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/95821147103.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b75224377---gakigalegagewigilisuvo.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/tewuziterokofijirorud.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2eac627ff---pimilonase.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/83686214297.pdfIn PDF document text
    • https://maturana.cl/upload/file/66152666333.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/405252dff2882c957463d997bd6674dc/83383558001.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/vebixojivukexamop.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/91992043747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=horarios+dir+campus+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_off0000e217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 23084 bytes
SHA-256: cebb928461d6518700c86c42099c52c59448cd45f7c20f803ebc545a701d6199
font_02_sfnt_off000134a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A0 10492 bytes
SHA-256: 7a1af5fb3aa08cc03153c547916fb55738958a6d9dfe17f9d7ecc7f0e02272ff

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