Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19ea2be5e8b5720…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 14:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c6f3af97860dc821f7a5ecb90d9fbf5a SHA-1: 1bb807d8469d5425cb2f97a96c601e2fce7c6cb2 SHA-256: b19ea2be5e8b5720d3e98a81f86c5f331da5532cf3f262ac5615f2a63d2c964b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The presence of a 'callback phishing phone lure' heuristic further supports this, suggesting the document is designed to trick users into interacting with malicious links or potentially calling fraudulent numbers. Although no scripts were explicitly extracted, the PDF structure and URL patterns are strongly indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://drafthe.ru/uplcv?utm_term=insta+private+profile+viewer PDF link annotation
    • http://sarljarry.com/userfiles/file/93977266342.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/lagemenikivovuwugusozigi.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/19954459351.pdfIn PDF document text
    • https://paradigma.bg/uf/file/nufatelekotamep.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/mokorerigodi.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/83640408367.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/7171884618.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/wanexizusazuv.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/vosilapagogifonalosiloza.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1356b38081d5ba889d832bfc20bb5390/famov.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/mowipuwil.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/roked.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/12f2cf3a85ddfac2bb19a7945d547de9/89463314875.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6f27f2b8d014df57f3c255acd66e8715/27614327111.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/02257405d411ea6abb1e4dc159fa04d2/66625459267.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/47416375671.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/68882990170.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vixoxibix.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/66362191951.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/razonopakut.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/38449768074.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/nulug.pdfIn PDF document text
    • 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_off0000b7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 10456 bytes
SHA-256: 5e7c33fe9ecd756cdf8c1e568d50b289a30ba2afe3fd44e99925e483c48d6ff6
font_02_sfnt_off0000e7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 14924 bytes
SHA-256: 0a29402bc58247f50825df35ed8d60737b10d541e85f910dbc7ec417068005a5

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