Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bc491249c4fc7b…

MALICIOUS

PDF

87.6 KB Created: 2021-07-29 13:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 228699d15bd88b181238355f5000b92b SHA-1: 8cbc7719055f80b6c2c748ec7edb95675e11ec69 SHA-256: b2bc491249c4fc7beeb1a582e7c760c3f166e7fd29da7aec65ad2f542ba4cd8f
224 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or scam lure, indicated by heuristics flagging it as a fake CAPTCHA prompt and a link farm. The presence of numerous URLs, many hosted on compromised CMS uploads, suggests an attempt to direct users to malicious sites. While no scripts were extracted, the overall structure and heuristic firings strongly suggest a malicious intent to deceive the user into clicking a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b0epd8gc5lurmkp8o53rjp5dn7/83353457053.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a397fdcc---fulijurusituranusarot.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/22ee6c198c1fcf431202ea6cf5994417/5771338763.pdfIn PDF document text
    • http://jaatkinson.com/userimages/mofutijodi.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/92bec9e120f7eca9487ddd2cde0ef2ed/sotilorujeje.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ceb6dd1cd30b24283fd1a7bf7dbda380/vijelinofa.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210607114558_n878fh.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/78207155143.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7eac042bc---nolojomoguweben.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1pd66t66i11i7mrf42s596fca6/70207268670.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/muzalefasok.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/85177693447.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/lerotuwepize.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/116c44d8d403fd516c275d4dbad808ca/76551427634.pdfIn PDF document text
    • https://sinarwaja.com/account/files/woxajiwedin.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fmvurk8gp8asmdirqm8g48df8r/ladezunufatebimoritejod.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97bd5ea79b---99790045446.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/59734548643.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fe189fd67244c748c36210c843cc48c/91113724298.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939b812f0ec---zodurarinaworapodumeter.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f6f85a19---wupoxajenanokalopedunotur.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/iuhbifc0f721v507r8pt10hq01/38568716928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=walmart+money+gift+card+balance+checkPDF 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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 17944 bytes
SHA-256: d206a870f6ae091fa46123887c722571cbd4f253cca28c1f7797d3f9a7299557
font_02_sfnt_off00013669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13669 11096 bytes
SHA-256: aba77b1f26a7522d5afe9d311cacb0f71367f5755b074f6d50d7368f8f08088f

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