Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b7e76edf31c77b…

MALICIOUS

PDF

114.3 KB Created: 2021-07-27 09:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b035128128df4cda0fb0286fddfa16cb SHA-1: 892159c0517065dd3966907a7fe05dcbe465dcab SHA-256: a1b7e76edf31c77bdadd1dde0151ef4265a3ec961eb025c7b3db0fae94b65a92
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, and the ML classifier strongly flags the PDF as malicious. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to deliver malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://www.vnos.vn/app/webroot/uploads/files/12401075096.pdf In PDF document text
    • https://poolpoint.be/uploads/file/roduvibopuwizejovero.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074a72e6a441---69578797654.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/ec5c118bda873287129f0ee2a741c1ce/37755598071.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934706afca7---rudopap.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/55aea70374b3d2b189bb45b48bb2b33f/57520681999.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/69397739242.pdfIn PDF document text
    • https://makenie.com/upload/files/mitituvaxovedibuduzozu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6ebc221841511de766873c4b85cb2e3e/93220703688.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/3237175596.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609005512ee3b---27011927235.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/20368210106.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fb2e1b12644ea5a1ba929463820454a9/suzoxiki.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/lqsspqibalid8oc8vavikacjh1/davafapamim.pdfIn PDF document text
    • http://amdind.com/userfiles/file/pufamogifafu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd8b777db3---sejewuw.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/17958994441.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/71672109163.pdfIn PDF document text
    • http://timebymtm.com/upload/files/37911229114.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/hkh73532dppdlo58fr12brqo29/zarebufolirokejerubevid.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/6282363165.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/91b91fac7b0bd0c9982598692b42ff68/41700701734.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/kigixigatasiwajini.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/12068858958.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/63776554957.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/53973863336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+reset+my+moultrie+game+cameraPDF 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_off00015a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17237 18128 bytes
SHA-256: 4d19494de734f5ff1ae5bb85f2a79a4c5d624f2bb3ab985fd94cdb7b16ba6834
font_02_sfnt_off0001a20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A20D 10760 bytes
SHA-256: 05929cd550fbf4f6fd2c49aecb9a29063575b0cf1717a97ffcda0eea3e77e505

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