Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3efdc1d4e98c4f…

MALICIOUS

PDF

90.4 KB Created: 2021-08-13 10:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3c3c1cf244f0e59579d31ee3d5f8512 SHA-1: a4a8b9a862610fe1c9a9d5a1cc16c06cc9f8e13b SHA-256: 1a3efdc1d4e98c4f726c18c19bb6cd1442b84c93bce2f167f888d9df86315ff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hostingyuvasi.com/calisma2/files/uploads/54796804020.pdf In PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/lujobedunixinezenere.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e534de0c---tezosuxuremizobiti.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/302ceed70524544d91e12724217c3eb4/70042197428.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607479057d5dd---4941848995.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/77240823728.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/965cc284c27b114341ec22182fd19485/28011287348.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/75200502504.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/30336030420.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac0e41d61---89454361683.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750f5e731c4---37838787717.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/gixovopirajorolitebabotor.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed6a3af6c---kobexudakawutasurudoso.pdfIn PDF document text
    • https://anjingliar.com/contents//files/6457068258.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/46465667496.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021052301658_151215107.pdfIn PDF document text
    • http://enricobarraco.com/files/vawivonojegepewomufaxiro.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a371f6cdf02---numerugisowemisodozazume.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/8b5f9547379b6a0a2f8d05eeda51dd6f/97424441621.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fc305192b6ac1d127e177c9688d2b5bc/13812615648.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/lakiwupugo.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/71f74d2f551a18169699d71a8f8f6e68/gozametemevu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc101ee604---ketevavufafivunubavume.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/zuluwitaxubitatomoxuz.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16e2578eb2---75335272539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=assassin%27s+creed+identity+game+apk+free+downloadPDF 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_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 11272 bytes
SHA-256: bac368975b64490e61416e8b558897b0a803cdc732908a1d48cc7e8d59b08057
font_01_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 17140 bytes
SHA-256: fb006cd220bbfbdd2af8d2bd2596133ec8c9055ba1e38cdc741353fec18d6960

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