Malicious PDF — malware analysis report

Static analysis result for SHA-256 57feaab92d7c102f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 06:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25a861f991ab2bbd498bd5cc1cf81d0a SHA-1: e16fc016b895fc1adffaaa5fa8022be1d9a4791a SHA-256: 57feaab92d7c102fc40b4e4cb46c492c8d5401fe137396716a372e85927c9d51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://agrion.org/upload/fichier/ziluvavelodevatunezur.pdf In PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbcc892ee8---93924907641.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/pojalolufidaxofix.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/mosuviriwus.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4e5261b53---17437460278.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/68a9897c79fe1522ee6db083c2820666/jupowiraxikujijemaxe.pdfIn PDF document text
    • http://glassick.com/userfiles/file/sawevivupezazimozivu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/7368644963.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/19936386749.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/98dd7sjge8i4bmaf4ik2fipg36/76510372373.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/92156054598.pdfIn PDF document text
    • http://hkacca.com/userfiles/63894802024.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/funikefap.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/41032191788.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee7ff5ab5d---xububobu.pdfIn PDF document text
    • https://airbays.com/userfiles/file/mewagoxepirivebutoduxo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161288feb7f987---48853199278.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/21183794314.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/fujiramizawosidamosexa.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/76571801665.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/15055517704.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/timajumupigubozale.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/60913563447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=splenomegaly+home+treatmentPDF 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_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 10628 bytes
SHA-256: 13306fd873149179e35d2462ad7907a9aebf18e6a7c8c2095c505445e7a67c74
font_02_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 18156 bytes
SHA-256: eac52e3295b27eb657f460348153c79987337a0d000d28e8feb5dfb73972a638

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