Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74b14f105c10084…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 15:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 75720c5f86b3b38b7d6ca798962d29aa SHA-1: a0483dc1c8c778a5c71acece0571081f23c8fcc4 SHA-256: b74b14f105c10084d3752a7156712cb452bf37e4db7ff276d8da841186aeea12
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing. Numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm or distribution mechanism for malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://coretry.ru/uplcv?utm_term=world+clock+for+android PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f42922c73---waxudaxurunax.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/11280727218.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/696bef0f5715ee8efb393958b04034ad/gevuk.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/nosutizubosivi.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/bepibepukexedilomarebud.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/71517520432.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/27541735030.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/50166088704.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/87528746528.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/44403385885.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143d993ab91a---jesifewiju.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/9116951273.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/rogisakijevukax.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090900293273499.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/gataxobuzijebimidubapoduv.pdfIn PDF document text
    • https://mkontakt.com/dat/file/8977293495.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/035ef8057da80b9c97b0c268e1e393ba/gozanulobaputajuza.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/26803046111.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/fonoralofezimorunepe.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/75864242679.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/variren.pdfIn PDF document text
    • http://packamate.com/userfiles/marezazido.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/99963215745.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/91712187345.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_off0000bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD451 16212 bytes
SHA-256: 0cf96b17cad58e6885bf9bd6474c973a4313d18768adf28a8d9c06528646a453
font_02_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 10156 bytes
SHA-256: 045f6d5aa11cfcc4deec648a767534827266d689c5e5602fe412c493169ae630

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