Malicious PDF — malware analysis report

Static analysis result for SHA-256 4779bacaf89bcdad…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 02:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a41eaf40aeffadf521582bafad646da6 SHA-1: 98cb0d0e3fd09f3d417c93fd3e913f3660a17344 SHA-256: 4779bacaf89bcdad98d007a7d9e58256dbc73da2b673ab0f0ad77513edb3860f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts, indicating a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d923cde0d80---besijesubatagexolonifod.pdf
    • http://pop-around.com/file_media/file_image/file/99936936168.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ks9o67nvkvj690u60nqkql6fmr/80432806095.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe1b6ca2de---3226390412.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609222f45f900---jabukujurubutuva.pdf
    • https://aimtronu.org/userfiles/file/wefarabasusejod.pdf
    • https://alate.org/admin/fckeditor/editorfile/37515442786.pdf
    • https://cliniquemyo.com/userfiles/file/7907386726.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/rizumig.pdf
    • http://akicgiyim.com/userfiles/file/44286238510.pdf
    • http://absolutelyneon.com/userfiles/file/vuborodo.pdf
    • http://sun-green.be/ckfinder/userfiles/files/74903036715.pdf
    • https://relans-nn.ru/images/docs/file/ruzafisisijonipumakum.pdf
    • https://angelsstaff.com/uploads/file/86645432468.pdf
    • http://spzpoz-zdunskawola.pl/upload/file/69984497174.pdf
    • https://sankaibearing.com/userfiles/files/kifakefabuvajul.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0a20ffb7---gutavejodumimepiwapewojov.pdf
    • https://perfectprojects.ro/userfiles/file/28408393568.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ea9c4ff1---89360273468.pdf
    • https://coebmsf.com/userfiles/file/vudasaxegi.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0fsh6endje4n7ve8b1ivgc1ipd/laxojagidivabojudub.pdf
    • http://pattarasawat.com/ckfinder/userfiles/files/wojokepurejodigovabudi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hookworm+merck+vet+manual
    • 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_off0000cf3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 16792 bytes
font_01_sfnt_off0000e750.bin
89a69a7fefed65539989c0715685d2d0f3f43ede4e57994e98492c9d4668a72c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 17308 bytes
font_02_sfnt_off000113ca.bin
5d7c3734d0dd1c3bbe5713b1a266dd8b2e29becf8f51b62d4c5436e1e1eec301
pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 10468 bytes