Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b8a0cc9901520d…

MALICIOUS

PDF

82.1 KB Created: 2021-08-27 14:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f1f53cfdceae330ed2d171db03c83fd SHA-1: 29a55e250e81f359232d94fe383e14dc65d9509d SHA-256: b9b8a0cc9901520dd95c34b7f586e37cd226dda5a3a22b70fd59cf1b6cdaff99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://crysiq.ru/uplcv?utm_term=mtap+electric+furnace PDF link annotation
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/pesuzijajenasejo.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/zasarapotegokefapob.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/19773296889.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/721g2biman1umb6c2simggig9k/71436156253.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e870517cfbd---fubowulev.pdfIn PDF document text
    • https://digireg.se/upload/15893006527.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/fb217cb02f3a92ca5f5686b25ce62a12/33152935295.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/25641594931.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/31014803549.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d472356303---supukonefemasewo.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/muzapoporisimixo.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/vigonesofepifusavinumur.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c921f28fa6a---33544543735.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/rabirawetagalug.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0088129f7e6e8fb3822b019a08df15ba/45235877072.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/14775529879.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/lexobi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0c68b4e---66358709426.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/robuzinaledo.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/19267230860.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/57802538075.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/salonunexowabekolomik.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1d0ab16957909e17d9c0cd77b41b50b9/vuwixobukepibara.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_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 10280 bytes
SHA-256: f1edc023655b68feafc55aead86d569be5e72b4fd3f97c4cc5b789422bb4c3d6
font_01_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 18716 bytes
SHA-256: 11f37c805015a1f3863344b3dd8187cce1a15b588ef2dfa0ce20116d559d4759
font_02_sfnt_off00012326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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