Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31f15c06f6e9b8b…

MALICIOUS

PDF

94.0 KB Created: 2021-09-01 17:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b906b6554c3dfb15e6ca86ce384ecbd1 SHA-1: babfd35422e95405ef1e26f1ee5268ca3f4ed3b8 SHA-256: e31f15c06f6e9b8b905d3059f5125cceb29290b65ca8c2ebed5a0f5484393773
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. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=system+of+a+down+aerials+tab PDF link annotation
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/fa80e05e6150fe1342b45a60f7ec8165/90879067561.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/j5dqcn3snln3rchqug7t8m8dsc/6283209408.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079d68850043---mojopunazinuzobenixi.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/20889474031.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078bcfc57dce---25755338223.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/31235456682.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/74219783668.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/fa6u8uhhocehrmt8bjvp3hst0s/19331612894.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/69976382853.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/88358d4677bcc2e467199565142c49a9/65223122527.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/dunotibeberafuvamiwopaza.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ec3f06f4---82421921111.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/92018463440.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9c23e58294b9eb712d860afcf148d13b/71955884960.pdfIn PDF document text
    • http://chapelguild.com/images/usr/61845167198.pdfIn PDF document text
    • http://klaaswester.nl/img/file/1194562705.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/niligakazivawojukudujuz.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/77639452255.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4446c504b4bfc4389f0a6e2dee81f4c9/dapuregaluxexi.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/60987114058.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/67927563605.pdfIn PDF document text
    • http://mosjob.ru/images/file/25560612955.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/68875243192.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_off00010b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 10932 bytes
SHA-256: c3b1cf62195d9a2c3b6be85d1b0e877a1c32c2a0895a7d7b3d45cdfa17ddd8c6
font_01_sfnt_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCE 17680 bytes
SHA-256: cc66013a5e439e85d93b211e05935015b1cd4b5cfc4ef4882c96c868f09aa22a

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