Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ef9a88134eb9f2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 20:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cf4c753ac590570d84477c27e5d75b41 SHA-1: eadbc0f34b6171f394eb075e91096cc3ef396b50 SHA-256: 93ef9a88134eb9f258b4333946886af9e3d3c62702a20e6f21c12092ac390893
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, likely to host malicious content. The presence of a fake CAPTCHA lure strongly suggests an attempt to trick the user into executing a malicious file or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ladida.asia/sporlegen/administrator/imagetempfile/29435079014.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c7d038bc---13524871418.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/25525902704.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/93756725454.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/xaxanefikoravafabobogev.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/69416865014.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/4235116835.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/87ff3477bce3e7f14ffa73e7ede06cc7/sabip.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/zinisotugala.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/62837375465.pdfIn PDF document text
    • http://xhzhengli.com/upload/jasurododapapukonuje.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/67370280160.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/kijovoragazukakuzowu.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/99757409914.pdfIn PDF document text
    • http://ctm.it/userfiles/file/8061501241.pdfIn PDF document text
    • http://e-sportis.com/images/upload/kaxefipozopifi.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b801ff7f---lojekuwowofos.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/lifotedawexazetedi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/9e8sllndgfav3dqkq43addafmu/92099735897.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/nazefifudemu.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/voziripufadejujizovurore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=spider+man+miles+morales+apk+mobilePDF 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_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 10764 bytes
SHA-256: 93c42cbb45310712def0e2bf7fd46d191f4038c5ec6c2583e77a60971273ab5a
font_02_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 17980 bytes
SHA-256: f5a21b3e895aa9105a1ce55678d51ef596dbd7d611fd723b71ddcbdfd661db88

Open this report in the interactive analyzer, or submit your own file for analysis.