Malicious PDF — malware analysis report

Static analysis result for SHA-256 47cd681bdae2cb5c…

MALICIOUS

PDF

78.4 KB Created: 2021-08-04 02:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04e9c1aaada99bc86a57583bb4d4d431 SHA-1: 9452cfc74be34e70996f8c57d2a6269f4fd44d70 SHA-256: 47cd681bdae2cb5cb2f3ac557fe4b9bbf844d331ff050687ffaeb7928feb6b80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to host and distribute further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16094d97da51d7---lojorufupudaxumilisamal.pdf In PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c563daef1a6ed40041b14b8d37247494/52713695936.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc675fb99---60242440726.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/robakizezizozivepof.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/03ba06a5d5e51e508764dd79f7444108/15704383275.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/lisavowinaseligawip.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608030f56ae3e---84753343312.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/96363552904.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/rululofuseno.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/ditaxevezikupamupanut.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/h73jam2ec8a21oi3ihr05ddhi4/80930690962.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c16006e74ff---fuvumexeguwozewituzole.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c418350bd41---82703052983.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/77001917689.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/u9030acv42kqts6umb8sg2dip1/zovapogageneviviv.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/hb5d29dnnnao27v2ogtkgviami/jasolosizezijabefozigoz.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d59c8868e---87737508034.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/70675442958.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/44448991198.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607140f56f1a5---42156813426.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d422808e2d---95659664275.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/kaxajanimive.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/68354909714.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/goxan.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/65rb7abimvtkqmptpd8lmsm945/82784731884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=b%C3%ADblia+sagrada+edi%C3%A7%C3%A3o+pastoral+pdf+downloadPDF 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_off0000c91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91F 18696 bytes
SHA-256: 830b066c15d159764229befad018c5c82c4eb3098eae32cbf518648d59117c45
font_01_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 11476 bytes
SHA-256: 4c17e8f99cd279ea6abfd35b6906668ef0d518778dbe1779fa2ff49c7cef51f9
font_02_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1