Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7a9fd2a43683af…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 15:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 937debec2dd9ce8697474517f5eeed2a SHA-1: d9cb8ef0a8a039886767c3e5f22052a35874c475 SHA-256: 3f7a9fd2a43683afecc3b7b7cbaa06384cc15cceaeddc4c3ed54c8eebddc995e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to lead users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=practical+food+and+beverage+cost+control+pdf PDF link annotation
    • https://mimpishio2bet.net/contents//files/9479036661.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/29820416933.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/sodamebigoferug.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/2f984d0560bca8296872fabb5a5b2e22/reriviv.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/xuluwazuxadonetinonak.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/kotuxitalumaxinobinafukob.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202108191903295553.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/30957916779.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/92723394151.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/97eebb5b565a4367dcc0804eec6a59ed/rekiwezoxani.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/39116279028.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/89225372079.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/bagokuba.pdfIn PDF document text
    • https://seerupit.dk/assens/file/62316623235.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/jopotilesinim.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/7db6551a66d9a5a6fc922478ff0dbc3d/supufugomawipararumajegoz.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/42b118da90caaa13a1469e7f05690581/54589791826.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/p64cngch91dol7usp6mk5mv330/70967759612.pdfIn PDF document text
    • https://flyags.com/editorResources/file///9993852240.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160813e33a9afd---49474410766.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/jipajotamo.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/54508803945.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a60949410e0---38547485244.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f99fe06e10fa68067c33282c49d7f93/55677408127.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7fb5c33e9---vizoxaxijapetafonoku.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_off0000bdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC7 16984 bytes
SHA-256: 7dd9a72e2f7b5652a872d661c5c167586f8f109c108483683d9382f721c87f71
font_01_sfnt_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 11000 bytes
SHA-256: e34b1eef752a2dc518612453acad089a0d97915da127c4965647fa7384d4c6df

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