Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78bb7717aa6e2b7…

MALICIOUS

PDF

156.5 KB Created: 2021-06-30 06:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1dfdb425485dff7bb053d29816544627 SHA-1: ab142dbbb1c007c592e18400580ab42ab6c8bb5b SHA-256: b78bb7717aa6e2b7b94bbb9117d32f96d29adea788c18a46d4a4796a78eb3233
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links to external sites, many hosted on compromised WordPress installations, suggests it is designed to redirect users to malicious content or phishing pages. The primary goal appears to be user deception, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • 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://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/5c8e92a66b860d38744114c59c6abde0/bopafamisofasobam.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb5165626---99741191284.pdf
    • https://abyway.lv/images/ck_images/files/gogajagevugikofasotujilat.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2d0ace0c6faf1da24bd9a8fac214b372/varonedivodekobemoku.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e3875cdec84b1d318e0ee0d5f59db457/pimepelopasemadagu.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501201712619642.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/27090369667.pdf
    • http://azizavacanze.com/userfiles/files/gimafigaxa.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb1976a75---68508854301.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/57857710177.pdf
    • https://davaocarrental.com/images/file/jibutorajanemodujizape.pdf
    • https://aterhesseg.com/up_image/file/xoderepevovanonopemewibe.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/ad7a6b462ccf140954635aba94411357/pimizilor.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091d4b7e9a59---66770075748.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2e8jfcqqe5i5nn2ie8cc4e8gt2/66803077887.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/926cc18f35ef6f4c78b46eb82ab80e72/lepujaxudox.pdf
    • http://dekoblickfang.de/userfiles/file/57714001784.pdf
    • https://advance-pack.com/editor_upload/file/tunudosogep.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c720bbb1254---70856622389.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2a974683f5a0ecc345590b0a6c35152d/dilowonigafanapibumuko.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160945ea70f652---dadobama.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075eab9928f0---25723992245.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/51907421.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ea0a5895---zifetipalujopugu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cambridge+11+reading+test+4+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002010b.bin
19acdfda5c5cb3bdbd655f88bfaa7b86ed9c421296ea8c3fa1eefb078d4124d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x2010B 18804 bytes
font_01_sfnt_off00023319.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x23319 16792 bytes
font_02_sfnt_off00024b30.bin
a850c6de19ae589f54ed8104961c5058a65d0c35dcaf9b21ec6e47c0e2f368fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x24B30 10812 bytes