Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc0d4cdf0db3459…

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 14:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 501933e0f5f271625720c2a812d87429 SHA-1: b11b1d31be90880468082d7c1f1ea811b90fafa1 SHA-256: bdc0d4cdf0db3459d3e05dd4a435c825d19a6babe329e272f9504c8a5094c496
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document exhibits characteristics of a callback phishing or tech-support scam by presenting a lure that prompts the user to call a phone number. While no scripts were directly extracted, the presence of numerous embedded URLs, some pointing to compromised CMS upload directories, suggests an attempt to host malicious content or redirect users to phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16134d8e452981---nagenolegukupawobi.pdf In PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/1fa9b904c50456131eb9345026278925/56676046914.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/64007587883.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/21416419376.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/80344600071.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/lasofovisuponerinuxega.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/sabuj.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/xadamazokanilujimitavezun.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9a6773583a3b6c17c8e4929cee68db46/70409829416.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/68665594860.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/zazimesakufelev.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/vikefoturemawiwufejab.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/kalasudumiluba.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/zolokerazofuzobetowem.pdfIn PDF document text
    • http://dges.in/userfiles/file/2457719882.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c1f8ccb5---letesoxikazotu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9e06c9004ca3424b4e0ae32eb7b09f83/somizosa.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/88820196061.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8bdeec3fa---mowodezadokegegimi.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/64163162818.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/10368992075.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c7297f54f34d3927751c16d1195c0f17/parasibukaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hollywood+dirt+full+movie+eng+subPDF 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_off0000b3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E5 11032 bytes
SHA-256: a100fd84229f25fe9084a2a9232b0b5e772858872ce24dcb8c3f0ee887616e47
font_01_sfnt_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 17988 bytes
SHA-256: 03beaa6ca5b5337c026838786e0dcedccdfadc6cd87657579b245cbb18694683
font_02_sfnt_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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