Malicious PDF — malware analysis report

Static analysis result for SHA-256 d883c6df67b3d4b6…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 18:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dac02b24e965f8acba261d8a36e9f3d5 SHA-1: a0129fcd859f7ec6d2bfd5512e469ec873505801 SHA-256: d883c6df67b3d4b6048216fbabbeafff5bb34a19bd3c31c771fec378eda7a8d3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to host malicious content or redirect to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://architettoseneca.com/userfiles/files/kixuzamegafalete.pdf In PDF document text
    • http://gyogytornasz.hu/editor_up/95287871220.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/sodupurizobagavex.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/gibipikudumerijuvow.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/dijufekagasejorof.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/labudutitemura.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/judaku.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/69658049098.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/74251834874.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/jeretoxofupupa.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/fijuvuvonu.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/dokutale.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210901173258.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/32192729094.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/mafepox.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/43514508418.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/94998287392.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/64392314991.pdfIn PDF document text
    • http://kelsenator.com/userimages/juzutapixujavabuzarope.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/146f9a3d91c73009a69643612e2b7729/rupijiwo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f446807a---xosinipifadegebasewafibu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6f9452dba45124b407c8b7ba934455c6/pofijebesojulunev.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/48175581691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=exercises+with+past+perfect+continuousPDF link annotation
    • 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_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 19356 bytes
SHA-256: 4a8e034a42f90f4395976b6bbe3a015513c2bdafc19f70fbd516cad477612c3d
font_02_sfnt_off00012fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAC 10804 bytes
SHA-256: 5c9aff3c224f5b67a7ddf6fa4963f160c68d4c8b95dc5db0bc661bd7d39bdb13

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