Malicious PDF — malware analysis report

Static analysis result for SHA-256 195023721534bd89…

MALICIOUS

PDF

86.5 KB Created: 2021-08-26 05:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b97b1c2982579fffe3a6487d18d19138 SHA-1: 80b0433eee6263d44fdf325700f9dcadb9f97bca SHA-256: 195023721534bd89c5edb016d5b3d7332a6feb9f96e76678b2490fd1b0c9742f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose seems to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075235d00b00---24743127130.pdf In PDF document text
    • http://avanti-kuhni.ru/upload/files/5175309875.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126e5dbd77db---naterupakevotov.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/63560976656.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/30074447618.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/408fc9538334625c305fb89a28b6a8a0/lepilepekevikexogowumasa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782bb799de5---gotefegefinafojo.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/29916551377.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/eoiv3k8525osdi2jcdkpe33a69/1221733497.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca94b98bd0b---16538554880.pdfIn PDF document text
    • https://best-label.com/upload/files/sududarulila.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092587fb1dbf---30053810665.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/retotofukapovubuf.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/88971971684.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850b5e56b6---zerixanupelilu.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/72150000013.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2bf801a43---1518839796.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/40743086471.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/vugabukinuxakenunebado.pdfIn PDF document text
    • http://reflita.lt/uploads/files/13289327597.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/de795134edba69e0b3e22f4177178800/61404376535.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/51111619968.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c7d701f1ca1676fd7fa38254321946a5/megawubelebexefofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=alliteration+to+describe+yourselfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/pudimuwowisipubenez.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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 17436 bytes
SHA-256: 56abcf20ac01ff7eac8a4346d47919b34a9cc9b4694440ccc192d8ffc66284cf
font_01_sfnt_off00011ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F8 10804 bytes
SHA-256: cdc33c8a22b6b69c63246f365440b586bfa27f8fac16db8f067c656ac0013416