Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1effd7c6ec09d59…

MALICIOUS

PDF

89.6 KB Created: 2021-08-24 03:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d4a9dcd1306742d3e3fe5e627dcddc31 SHA-1: 8ec9b98ee8923520cbb66de0e66bcdb72514db7a SHA-256: a1effd7c6ec09d59988e3c9d721e8724ea1925424015a3ab7302e2cb77c2c81a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=the+ratio+18+24+in+its+simplest+form PDF link annotation
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/tl1iak48gfntfjfr0egd7pnkbc/xosivatubip.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/c818l8uredp74u1ghphbid5rh4/nerolivagopakagukozebevu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4c32f103---bekufosiko.pdfIn PDF document text
    • http://citranco.com/users/files/tagimilisoxemenemof.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ad2f8d31a3d81387a9cc6134ce2635a8/lekopagufuzozi.pdfIn PDF document text
    • http://nfc.soo.jp/file/xegawoturide.pdfIn PDF document text
    • https://oicenglish.com/imagexx/files/59631513997.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/ziretojikune.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/70bc6c8baaaf52b246d0af60f61c673f/fibokugazuzimuwed.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/vonozimudamuzamotatos.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/72876132790.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/32888444711.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099224c7102b---38816092742.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/3588314384.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/qs1m60gkv5jrdljg1gu3tk4uj2/suseguxofovi.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/vijedifelojo.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/xovesozagigoge.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dca2372104---29689464619.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c22065d7a85---31014570750.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/01fd8aeefa1d28ecca1b7b5846ce4e08/bimuwiruzisefulinokufiso.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/33726568073.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/sajowapad.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092e6138878a---wuzovigixisenatimapu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca00d1b5c31---71179241779.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/bugisefokakuxawitan.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/kaxugotulizesuloluwag.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6d0803b1cc7c8e7d48ebc36b7de152c9/61356348356.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 11044 bytes
SHA-256: 84b9c9ab38999b22e4a3f9dc16f7aa48007af09afd269da103ccd2034d438e90
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 16724 bytes
SHA-256: 46eadb034141f7ad50d63bc3c67771f1176763e06c96abd7935836c574e1ba67
font_02_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 16144 bytes
SHA-256: 1bb543891201b86cb218c82ce0c1e431878b85d3145a79f40ea94bf38162e691
font_03_sfnt_off00013f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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