Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f51e14dea716e7c…

MALICIOUS

PDF

87.9 KB Created: 2021-09-05 08:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fef781f4766ec7c0a38c9a1220a2bc7 SHA-1: 8051e4c283f8c793fc5f3aa351674b77fda113f5 SHA-256: 3f51e14dea716e7c07c0b04ff5d69632ace016980aaf0baa5062b5f29de9e7dc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8720acdd8853c960dd950170d92096f1/96151650215.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b38535e605---12159876238.pdfIn PDF document text
    • http://apcmagon.com/userfiles/36533122998.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e83e63f24b---63455259029.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/71f7338ee26a2d228eff74c93426165d/fapaxusogif.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/23731820589.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0s1tsit7vlssjj5gmjjhg5sp01/44709364165.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/pizoxegoso.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/jipasutijazasebanorutizir.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/34063993992.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/p7lrkt2ofut6mro2qcko509soq/rikajejitani.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5591a9bf49d021cf16da98d4066d4ba0/foxovegivosiletekojamipi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160e78c757f39f---50108363995.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/dale5rhc0knq2834kol4iesgc0/vujimexajimogod.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c41d755bb5bbfb283182c89bd274d238/fubudagenanexideputepi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kamuzenolam.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/vesevafasurufotufiba.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9037b7a0400997eb42b05dbf086d4d60/rojavivagafusunofomubo.pdfIn PDF document text
    • http://rayer.cn/d/files/kogotomazemivogotul.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/viwusoganakuporelok.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609914ba39693---werelulitomepazotexukoxix.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070c5d48f766---raduduseveruxevuzuxugurol.pdfIn PDF document text
    • https://zold-kommando.hu/files/40129709611.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/81261321821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dua+during+pregnancy+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_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 10576 bytes
SHA-256: 6e888dc917acba458baccd8d4ef8b21fad64cb54df90604729443ba8d482993a
font_01_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 17036 bytes
SHA-256: 8533278490b711ebf653e8211245464528df11b23fa370fc1795c38b1234e885

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