Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ef7108e640d33a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 06:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2d49940bac98b9a5364029cbacb8aa8 SHA-1: 05b1ccdaea6b0e7abd4f1bf226df0a232f74bed4 SHA-256: 56ef7108e640d33af9790d6854142a50dbe73a2bcb0e73a30d985cfe9402f932
196 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. These links likely serve to redirect users to further malicious content or phishing pages, a common tactic for distributing malware or stealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://inwebjor.ru/uplcv?utm_term=meaning+of+android+version PDF link annotation
    • https://mashura.co/userfiles/files/33180876604.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/95302717963.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/48425630228.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/nitubebusaw.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/83261460148.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/15161490107.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/fokotadiwagugowenipo.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/56a0844b9abfb8710b2458ac1d9991b9/89230059157.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f58159bfa1---44480776121.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/16672972562.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/mibuzufitumefananelol.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f451166a7c00ce4befc4eea9b8555943/tidufagavagewilawaso.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/3985722310.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/39322779848.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/mbfp5cl9nl8iu3il4r1vf0h7fq/fesozato.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0vh3j9g41v0dj8bfekpk6lfpq2/didatiwimepeje.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-12-21-22-30-LleoHzcb.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab740981e---gajifizovelowiru.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/sowaremenejozofikudi.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/84787237590.pdfIn PDF document text
    • http://bushurov.ru/images/files/tutasewefigojeluta.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/51196934307.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/zasurivokofufe.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/55893179845.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_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 10444 bytes
SHA-256: e9c3cf9b416c7f49b8498e3a2a1f4b035a2fd46f28f1decf2bd9e76a36fb55f9
font_02_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 17364 bytes
SHA-256: 8547d1074798c78b9080f7a760cec0657cf1b85fee04352fd627ca33d5052a8c

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