Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe37c2c12159ee7…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 13:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 393a45f1565c23fc90d88c4db57f270e SHA-1: 397c67a53f841cf6a4d4cfe0275719ddb702e3f2 SHA-256: bfe37c2c12159ee7b16ec8dea92f4e0f16a4908aed56abc1dfaa250682addddc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress sites, suggesting a tactic to host malicious files and lure victims with deceptive content like 'free fillable cms 1500 claim form pdf'. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing campaign designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=free+fillable+cms+1500+claim+form+pdf PDF link annotation
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1acb2c3e1---radikarerekasekinexan.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/66950193498.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/nixikejibe.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/3449cdab65d5af45b7618f788f82685e/29745865971.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/debuwitunugegare.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8cc4325e5---68021211401.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/69236943613.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/sudokoxokozix.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dccdef453---lopukebepamipax.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/20834261596.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7d0b88e5a---1007261268.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/dumamu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ebv0p8mj1hdm9m5o44qpd1nlev/nukoburubakiwagakapo.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ed5715867bd---poruniwuzaga.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c915f20eec---paneleperu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5eb8229f---jigasizolikatilenunojipu.pdfIn PDF document text
    • https://x-software.cz/data/file/zeritokenasemowus.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/74880765605.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/rruf2g78nmeklohn3mukb2p484/50761784349.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/50904602766.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/limibesofemeluruposonut.pdfIn PDF document text
    • http://th-hl.com///upload/files/wofejimaxin.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/43e69c977d51bda06118b7897aaae379/92841632114.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_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 19284 bytes
SHA-256: bc49291a1bb4e0cda4d8125fa1dfb7b3f6d302b7fed8a11555b0597ff05a214c
font_01_sfnt_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAC 11004 bytes
SHA-256: 56a1be5eb0066930016cf82126f29251a0b04e388ce1bb8e51921bd1bcfb0963

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