Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a8ea5672e73c1f…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 12:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f978f2a2610e77ad5bcaffe97258e41 SHA-1: 27cbe179a6fa87708554955ce5583404b0208198 SHA-256: c6a8ea5672e73c1f6edb6c90467a1a5b09b3f3e88326f0979f39462ce18105b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple domains, suggesting it's designed to redirect users to potentially harmful sites. The presence of a link farm on compromised CMS upload storage further supports this. The embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a5f63803---jajejimubem.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/vegowajuniwipuzof.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210531144634.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f67999229---lizibojokofenobotig.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/9d2012b0142d4464f375e6d14f9f6a1a/57187791409.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/kufegifupik.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb0320036---28213404966.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160785cacc25c0---81731630611.pdfIn PDF document text
    • https://memoservicesrl.it/file/sosarefimenagoreladiwi.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210604_180351.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16126ce0cf09f7---11311951096.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/43437674123.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/12247672890.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c1aadac7f51117f5d6ac617959f6297e/wulofabagu.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/kukaselevojazemowewivi.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/60025393215.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/topafikixolanudij.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/jowob.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/tubuvijivarodipugopowaj.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d94ed150c5---kidosukikerulaxokejuwome.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/50343043164.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/31412570668.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2105292331163822775yz011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=goiter+on+right+side+of+neckPDF 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_off0000cca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA0 16948 bytes
SHA-256: 18217fb0d30310a0abebd149f62d38e62c8885655915aea6d1d5448c2e83c54c
font_01_sfnt_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 10680 bytes
SHA-256: 73eb4bad26d145350fa17597b5f18f3e9a0bd79617d409bd5316d589b0c6c247
font_02_sfnt_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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