Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b422f3841ba3b2f…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 16:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: edf2db5d34ca009e613438b295e25971 SHA-1: 92c5876294dd7cbba60e9605fcb9ca77dd82ba23 SHA-256: 3b422f3841ba3b2f518ea14dcfb6d7d054889ee8ec496b9f8e43a5cfb817ca33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of a link farm on disposable hosting, with multiple links pointing to compromised CMS upload storage, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rajatotogroup4.com/contents//files/55801232508.pdf In PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1712152253a0d4bafdb7c2ab45f31e9a/955420023.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085867be8530---regowimupugexu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793d4ab655d---56110515407.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/19e836e282ebe484cd91b824687f6d27/govipof.pdfIn PDF document text
    • http://askort.pl/Upload/file/wogisasipuvu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da597123bea---bodif.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082eaf52e5fb---buwomemorifogitonudu.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/9976489381.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/3805384324.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/835ad19585a3e5b12be2a4f45f6274a8/80891826081.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/62218010011.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/6242749820.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/nedopevitivofabalefive.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/9udvio8hqrt73ajn6mbtljo5e0/rolewilisujonuzonilinezok.pdfIn PDF document text
    • http://wamer.org/userfiles/file/malexabalezibovazod.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qff51ahap927nttiubkiaq6obp/werikab.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e72b4c863---gusojubakokejulewuwer.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdfe93f140---81564856802.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a97adea36---23693657244.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/8391595858.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fab48e0352---junaletowixenasisa.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/t4f96kqgok6ahqdbjpbl1djjs0/fodadaduludu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/64b26ad343fe69c1de7d3b083ad17eda/10405371439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nonmetals+metals+and+metalloids+periodic+tablePDF 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_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 16972 bytes
SHA-256: ae4ea9c4883105dcd86c97ff6a930c9f737b08a0c1c3f429ced1bee45d7002bb
font_02_sfnt_off000138e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E7 10792 bytes
SHA-256: fbd36afa636c0510abff7df1766aa7dfd4278299ce9ad8d71743fea1fe5c149f