Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18ccca1cbfc4ce6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 06:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56ad2ba610b960cad9423f2e56aec030 SHA-1: da27c982ec6f2d345b2934d3e0c543a8355b06e9 SHA-256: d18ccca1cbfc4ce6e46b1854c97134fe2652488f964467705a48ad1c6f3a510f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document's intent to trick users into calling a phone number under a false pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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://inwebjor.ru/uplcv?utm_term=one+world+a+global+anthology+of+short+stories+pdf PDF link annotation
    • http://www.jucadent.es/ckfinder/userfiles/files/70225103026.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109202019492466.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/34752720127.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/99548452620.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210917_9EA0EB49BB5C7039.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/64899189912.pdfIn PDF document text
    • http://szcftz.com/upload/14933849575.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/lv06drul7p0e8luhai8ptq0lq3/mototiwabapetibibu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/29705174047.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/10/92392605713.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/43233742432.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210910124256_forge5.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/34884934234.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/kezofulumumupotivelovo.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/virabopabuleke.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/58063882014.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/zazanilarofolewabi.pdfIn PDF document text
    • http://apcmagon.com/userfiles/95674613030.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/73809625261.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6c2ca98eff4a457aac2a6f1494f75d6f/69094811674.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613543d30ab04---67248830262.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/waxukemovedejafosun.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/supowem.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_off0000db27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 16544 bytes
SHA-256: 42cb58ae033f5d0395661cb4a7a31d7dd2075b33c978c494766342d3071a44bc
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 11144 bytes
SHA-256: 2c5e0c41fe315619c167f6fbdb8379e8ff9fa41ecda25b1c33a07eef2fe49035
font_02_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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