Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbacad2f66970d8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 02:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bad75fb8cd17c0fb86662f75a37a4347 SHA-1: cf59965f711eecaad1aed86e0e2e6ad7b8f3a569 SHA-256: acbacad2f66970d8feca2b7d460504d8a18381abe9c7b69c49f4317434e97fda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=clock+on+screen+android PDF link annotation
    • http://www.motocams.cz/ckfinder/userfiles/files/44829109396.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904120057356829.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614697eb4508a---kezakefop.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/85553968386.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/loxorixag.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/zazojigelikilam.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614555faebd24---41426400775.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/pulinalajer.pdfIn PDF document text
    • https://masukpt1.com/contents/files/doritijikonokaposolefu.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/40938189861.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613332c9a6b39---31339404185.pdfIn PDF document text
    • https://petek.biz/resimler/files/20175773908.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/56836770388.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614a469d0c533---9125993119.pdfIn PDF document text
    • http://chinahongji.com/d/files/41588741057.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/95929732526.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0aaffbfaa64bf6f66afcc0c3b3d03a38/kokipibozefi.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/wewosezofaniru.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/jezapuvizozezovox.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/65153122923.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/vawofizivotazowowiruwek.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_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 10388 bytes
SHA-256: b3c7e20f89b3b16230d8c03d9921903dd6466b1ba66c4b3074ec6553a70b7ac1
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 18912 bytes
SHA-256: b84cdf9e304d3a2559e46081d743e3cf71a3088ed23bb2e91da625d4b81a5f1a
font_02_sfnt_off000127a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1