Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc165aae03bb0ae2…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 20:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e25acff2f1659e5528080988b584b51a SHA-1: 49401cf8ef6975c876d7cf2dc0c752e7c4a926c1 SHA-256: fc165aae03bb0ae2e620f9c26159b0a3d3e612b1c78e8494e9fa4f2cc312cbc5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the URLs serving as the primary mechanism for user interaction and potential payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=past+tense+present+tense+verbs+worksheet PDF link annotation
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/pegeronavaju.pdfIn PDF document text
    • http://cordovajewelry.com/images/file/12819552590.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/foretifatinagirigagun.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/42977547015.pdfIn PDF document text
    • http://0851gay.org/userfiles/202108file/2021080910043470554.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/pikonokesukunefa.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/fexisubezitiniwedot.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4ca5176a03ff72c57513a63ce5fe2f7a/93041074486.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb044ba73---4614566428.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210708141134944313666.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/scqa2ht4cqs371fp7hn1slu6r1/1330167201.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/daletabegolid.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/aehbll59mq4qlgd07eadvtpmqf/tivizikopumel.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083c15a755d4---49535056092.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062618042473499.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f63df96a58a---60444718417.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1c6294124d69a159d8a3bc62fb4bc42b/46929874749.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1e213bcbe6e15579c09c7ecbb49d308b/sosoxejidezibunosuv.pdfIn PDF document text
    • https://avenue102.com/uploads/file/zalovisetogijobirov.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/55745490792.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/zenubogidunoguw.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3akb4drfq3vg1j1e333q12e0f0/25074351017.pdfIn PDF document text
    • http://salt17.com/userfiles/files/nuwawom.pdfIn PDF document text
    • https://synersys.fr/contenu/file/72121545622.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161095af5b5400---48187881067.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_off0000b8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A7 16304 bytes
SHA-256: d36184458677c220ed23bc9da25c2402f6a50d9d14374e10bf3cbbb189ddfa96
font_01_sfnt_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 10596 bytes
SHA-256: bef91c017cea41f8beeeee8bfb5e536abb8d903e13643bb600733bf4e15300c2
font_02_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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