Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe11a1e50f5c58e1…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 08:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0d32d1130ef57bcda0c98ea747f4fb54 SHA-1: 8ece6bb529c9907a7f759ca04f37eeb812f7edeb SHA-256: fe11a1e50f5c58e1d62e06dd1fb30da0822039c6c079557f0f6289df9dfb35b7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple URLs, including one pointing to a compromised WordPress upload, suggests a phishing or malware distribution scheme. The 'SE_CALLBACK_LURE' heuristic further supports a phishing pretext, likely aiming to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=u+step+ii+walker+manual PDF link annotation
    • https://ladida.asia/sporlegen/administrator/imagetempfile/rizemogu.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/63392256827.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/bozumatebakoxe.pdfIn PDF document text
    • https://keongracun.org/contents//files/4135754054.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/82417364197.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210516135256.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/nofunudifo.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/notabopagew.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/77170300115.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/dexobibajoketo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160965e9b988eb---zodixusok.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14f7ef185---44001740388.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098460c5407c---4059752371.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/19915200966.pdfIn PDF document text
    • https://coil.hk/upload/files/73915741262.pdfIn PDF document text
    • https://taperagi.com/contents//files/9624402110.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/facb75217ac6c754d9e6e6d547333b7d/42007490528.pdfIn PDF document text
    • http://maksimetall.ru/files/88115156237.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/91435830669.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d59380790c1ccaef803680450ab0435f/25269461815.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/gururitevosakoxap.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/20567344478.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_off0000dc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 17376 bytes
SHA-256: 0e2addb2712b33b556bfb04f78620538880d214ab7cc5da1c3167a50fd762c3d
font_02_sfnt_off00012166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 10580 bytes
SHA-256: 02e2c987886ce042298ce10af8f94dcd370205d979e718667d896b40d69c161c

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