Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc04d4712f402f7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-22 09:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36b7f6da1108816849feb6476b958e0a SHA-1: 3ef644ec714ce41f9cd8a2141e347618286defe7 SHA-256: 1bc04d4712f402f7f15cf42a45a73849a19d2129ab189a67d6c8efea3badd9d8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=cara+membuat+aplikasi+dengan+android PDF link annotation
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f3eee5f4f8ccfb2101e43514bc1de190/65155443384.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613298a980f45---43184258004.pdfIn PDF document text
    • http://liily.jp/upload/file/20210911112008.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/82892562303.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b4490086bc97629d30fb2e20f8a813c3/jabemotamomasetatexuka.pdfIn PDF document text
    • http://simonide.org/userfiles/file/xejevapufibowuxogejine.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cba9b196715eb37323676b529c204c6c/17327010882.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/34721529324.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/8588569723.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2107eb6e92a1788a1735259254d313af/61218844214.pdfIn PDF document text
    • http://hidramaco.com/files/files/26858213925.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/61885362029.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/14169113946.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/tavolubaxebu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134d819418a9---nexadoj.pdfIn PDF document text
    • http://stringladies.cz/userfiles/39316276232.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/fajirawovirufi.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/pulikinakurigedanitedovof.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/210417259256.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/wigenozubamitelomure.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/jogawezor.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/zunazabalikowoxuje.pdfIn PDF document text
    • https://bem-sa.com/img/file/9795326459.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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 16404 bytes
SHA-256: 33d1bf0cb06c6068c243ef1e93e29dc42f1fede114e4ed66ede43b48f0fe47b0
font_02_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 11096 bytes
SHA-256: 62bde8a45ca34c26e522202ebed7ba72bddefa7f1aae2c35fae6d0f7c72b0a09

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