Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d18e4704a42b7e…

MALICIOUS

PDF

80.8 KB Created: 2021-07-14 05:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac160e66291f76bdfe118ad3998b5caa SHA-1: 572c2fbccc80b5dee9aa96855cc5c66ca177c478 SHA-256: b4d18e4704a42b7eb1c4cddd64f1b11adff05d9d0258b7cd7a4e7b564e45aa29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute phishing or malware. The presence of multiple links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=math+worksheets+for+grade+1+addition+and+subtraction+word+problems PDF link annotation
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5a7fa20bbd4182ec8b03c58903728c76/moterowomemiwodatasimutoj.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/li2rdmbq61j6hgsk3373jlj1ab/79812115465.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6729313f31a5b26cc6cab7801a22c54f/xotofupag.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/329376f587406b33df4c3bb1b8446ab3/xosuvokubebaxu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16095f71b2b451---43222214524.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/51800488431.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/55644214453.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/netainabq3b4pn84cs6gibei03/bixitiruwagewuvudi.pdfIn PDF document text
    • https://drlanda.hu/user/file/69985850711.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/29988678866.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/wifekimomafojawazonifozo.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/lerukuwutexivoxogel.pdfIn PDF document text
    • https://epiphanych.com/images/file/latoz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608975a20b76b---95705032773.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3e71e1343---68289788335.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b86f8ad03---42753476038.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609012cb3cf10---tetejupoziredifibow.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/xogirivuxedanomasi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4bdkoln67p51f3j6f4s1pra072/39610614693.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/601261b9e4ab89a1beb2476b5cde4a46/vabuxosekatadebiloti.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/14400066823.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c71e41e28b---wujaxidukitezofolajutukit.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/t1jbe88p7vhv0goq3oko04nmph/dopurivinudomal.pdfIn PDF document text
    • http://minhanh.com/files/3048744348.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_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 16404 bytes
SHA-256: 0696744331ae22a31bf1ed4224ded57dc173ff7e6bc7cbd0b194d5efff0ef663
font_02_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 11532 bytes
SHA-256: 67a6b1f94168d4686ac292623290406da797888f36773a434ec91697974e9fe7

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