Malicious PDF — malware analysis report

Static analysis result for SHA-256 8407e7f411fdb56d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-07 01:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c528b4657bdb0de44a205d7b787f5ed9 SHA-1: 963004c64d5a8355ec5446ce0c6e7f508367cc50 SHA-256: 8407e7f411fdb56d1cc13f2af78444f07b6ef2871696f507c8256e4f01185890
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to distribute or redirect to malicious content. The presence of external URIs and a link farm points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://dianacb.cz/userfiles/file/55468183864.pdf In PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/fixewex.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/88866003233.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/78120522707.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/b1lc41vu2ctktogsu32ooppk9n/pizedu.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/nimokefe.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/fobamijujixikujenil.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/20a52c54a00e5d419daf5bda31073ece/18068110349.pdfIn PDF document text
    • http://nfc.soo.jp/file/ruxuberotuvagaviwiruf.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/kewakipejes.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/melekazuxupolebine.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/48562655461.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092813fc8095---56980093782.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608934292634c---jigot.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd61fb06087---34732937250.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a15778a696713bb6ca85083383d16321/10698585003.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/o2je6qvlevgjc70vm66n3vic3s/17430675712.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/xovuda.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/8414345395.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bibikapadosukawipeteponol.pdfIn PDF document text
    • https://dineflon.com//files/nefibaputamixuwulez.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/pudaxuvowopopudalugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=post+pill+amenorrhea+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_off0000b979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB979 15372 bytes
SHA-256: d1c725dd79a05608d243ab42882cd41c238b7e5379e42a27c71ddaa4cc58d62c
font_01_sfnt_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 10764 bytes
SHA-256: 711f2a0b3b30a30966ce71dab816e344a2dd9dc9f646aec9e0858694c9f70cf5
font_02_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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