Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a4d822b52524ca…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 19:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 128541e9f3a96cd32ba72959332a50b6 SHA-1: d82cb005e1328af4487aecc21a841490f63c6c51 SHA-256: 68a4d822b52524ca306039b3df00f9d6f89d307efc4cfe16eef54be7b467a9d6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to mislead users or for SEO manipulation. The presence of external URIs and the overall structure strongly suggest it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://skikk.be/app/webroot/files/userfiles/files/95677271433.pdf In PDF document text
    • http://riskhedgetech.com/uploaded/file/51836462060adf3314dccd.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/riluwupujegebibeke.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cd064672d---zugijegurew.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf15793aa4---lawenozuludibu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612506ef2b410---86180194756.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/bfac81242a1a9f977b1d171c31eb82fa/28761232492.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/86210131523.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/15684220742.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/fikazowen.pdfIn PDF document text
    • http://boldogelet.hu/media/fivosazixoxofafulatum.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9b9b18f7b---rajejo.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/lb8oq1a4b0qu3huvgj257nblqm/natigutopejiru.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093b76f22908---5503088472.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b27388164---7632707520.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/92703733918.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/todigoxom.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/kenavejuwunasevu.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/16163812300.pdfIn PDF document text
    • http://chinazzjx.com/d/files/78375555766.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210904_41D63D2C4904E582.pdfIn PDF document text
    • http://hongquangled.com/upload/files/padogeli.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/4302301583.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/36e8c760f9815b36d3507ecb74fe8257/65992788611.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/gimijelam.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607136e8d707e---xidogilikukogud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=solving+equations+with+fractions+worksheet+6th+gradePDF 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_off0000dacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 11488 bytes
SHA-256: 0add5b371cbd9a2cd705c5d484fa83f3ea849fb88c593e2e9bfc44b6f9526f34
font_02_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 17912 bytes
SHA-256: ab90dce918f2123318ff8725ae9bfd0a152ebc4a05e9fa8a9531c79e37302422