Malicious PDF — malware analysis report

Static analysis result for SHA-256 e244a27f843be8ce…

MALICIOUS

PDF

92.4 KB Created: 2021-06-28 15:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6b2a4779c6f072dc01aed66a8bd413ed SHA-1: 50a449ae97c95f2640c068d26cb206c52dfaffad SHA-256: e244a27f843be8ce2b483679dd091116c25295be3152e0e6dffb2cd0931a470e
156 Risk Score

Malware Insights

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

The sample is a PDF document identified by ClamAV as Pdf.Phishing.Trojan. It contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pistant.ru/uplcv?utm_term=lead+singer+panic+at+the+disco PDF link annotation
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ec6fc8ab9---29587598166.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/mogenuti.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/583077b0dfa16729aca290d619b260ed/josefuwodak.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/969bc920cdf88d0ac4a6518e8c393ad2/66575858305.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607223be22691---24831103479.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73289ed31d---fulovejuxekobijigafiko.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074138326722---5003242411.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eu1tj1clb3m1vqtfgnpa31eaah/94120535355.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1b5f527b14a4047174930e25ef05d1db/komegumijunufekofufuxik.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/l4fk8e8titlkl6uo9gldu9ppkj/kudevokonolabofikusad.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/monisojejaw.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d68280ee73d577cd845569efc8ce7c17/duxuve.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e4b92f02546ca4cab5d878c150f9d9e5/71494487561.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/nisomotutowiwugagiru.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/jewininilinubogenodumopa.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608133548ad29---92333828617.pdfIn PDF document text
    • https://777mto.com/contents//files/lovobuzitebesat.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc7a6f5f4---61920129388.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/56320523370.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/igfofkqjrhblnjpjfi3u0eqda3/xajilupajugaboziv.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bedd2f650e7---zemigatepoxurejevotamim.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ta52r4peu8ejldg7gkt9np3g43/91851293885.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/rediloxewibusudinal.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/b3b6b7177d31c4da388a66905167043b/fexokulad.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_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 17968 bytes
SHA-256: fab9818a351bc2895a6a048041d5e4c304723a497493c12a7d2869997919bb3d
font_01_sfnt_off00013431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 10704 bytes
SHA-256: 2a61da08337da0331d197c0ccaa4ed2945742617828c4a122f6a3aa1e2cc89a0
font_02_sfnt_off00014c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1