Malicious PDF — malware analysis report

Static analysis result for SHA-256 654d27b4516d50a1…

MALICIOUS

PDF

97.7 KB Created: 2021-06-30 08:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1b1304718454efe9604e1441355aae18 SHA-1: a0baeb94e464aecafeeda9f88ff133cabc1ee5f1 SHA-256: 654d27b4516d50a15e24d6773ff69d2fb5d09333643f56ba4c9c971ee39899a7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple links pointing to compromised websites, many of which are hosted on disposable domains or use CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristic firings suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/79c80b645bbba401055b89f0a837e4fe/62535915190.pdf In PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7921460497---43892964149.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160763242e56b4---28009190643.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061323561623.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/shd705msiahbqim4dn8q14u8u7/puvoremevetor.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e2241a5b5---fidigaxar.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888814df13b---91156945952.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gilavizuvaguvuba.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/wobaxitebagitodilu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eecd398514---5885602556.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/65ioc6qoh91hcu7154ne74u13j/kunadutixunulexutasujojo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084739d467d4---23985198361.pdfIn PDF document text
    • https://airbays.com/userfiles/file/latodixifobitala.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607250773f1bb---rulusenedixukifavog.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/bafeluf.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/70445829016.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1a8796dfc---wevatezawifofulajigatu.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/35578741199.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad4eb24b38---nurewolimuxexowopugata.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/eoca0023h590nqi99gcn7134p3/dobele.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/keseghdevq4mduj83n5p1ukuq7/velosiwalobobiletabe.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/xepewewuferilejadanewuja.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/xigexugabomuru.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/47374714770.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/38196f7750212625cacd0ac9e61c2f22/31184578760.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/50709220757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+calculate+alkalinity+as+caco3PDF 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_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 10676 bytes
SHA-256: 27ef6c98ed5ba6f6cfdf2f9db243372b0a8ff86eeb3820a33f28cdf75b1c5097
font_01_sfnt_off0001319c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319C 18124 bytes
SHA-256: bf613adc21e71e1f32f88a02224c81abb42b356967850d6caa215de0a6718899
font_02_sfnt_off00016154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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