Malicious PDF — malware analysis report

Static analysis result for SHA-256 854634c382fce73e…

MALICIOUS

PDF

103.7 KB Created: 2021-06-30 16:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d18444c97fc32d5f4afa03f6aae474f SHA-1: a8b526df2515904b05b0c5ea4dc20f28c9346b4a SHA-256: 854634c382fce73ef1278fb497e261ca8e4c5ea8f63423bc6a513b749661d630
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains embedded JavaScript, which is likely used to redirect users to external URLs. The PDF's structure and numerous external links suggest an attempt to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://sgcaregiver.org/contents/files/64868021901.pdf In PDF document text
    • https://dptech.vn/uploads/files/fesupudosem.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/42363660263.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f93c53010f1963a2e6d09574b898146f/gosejagupesopotodewesif.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/42029290790.pdfIn PDF document text
    • https://ancoraeducacion.com/images/6511331159.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e48ae851e---rogodegoxuvoxebip.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/s2reta4i644auiq1cn03r7lvea/wugibemuxevog.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/89285867671.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/e4ca62fb7e05a65e792b295b6bbabe62/12383774885.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/q63sj1u73fbe6r27ejtq0dc9ff/33577361599.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210601143731693519h1du0r.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7er0av6b2nfmrnm58p3s4qdf98/piromexorumejasotikezol.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/pulefifoposezese.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/s5l73artabmc8agestmohn3eh5/62289541173.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/zunibobadogojuvarusojakav.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e1784d92229342e26eca6dd124387261/lamuwajovup.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/sivumoxopavopo.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5i24qiigc81rnmv1m7ql43ss6a/73447048307.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/41c6a5685bd441f94f74dd23073f75ac/32884994194.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ffb82d74c---98074342929.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160894479b6195---xasadux.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075871faa234---bemiwodapavosagijun.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/tevewunobugefas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=force+unleashed+2+codesPDF 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_off0001343c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343C 10472 bytes
SHA-256: 34df6a2a55fb987e95af9ff8c890831a638db3da0815ca229f78aa52f6ca437f
font_01_sfnt_off00014bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF9 17364 bytes
SHA-256: dd133cad28369c83a4502ca0f53e8ae971182e5383f9af52a08c3dfafac56cf4
font_02_sfnt_off000179ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1