Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7c3fdb535f9407…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 13:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9e81331ed834bf54a5e5a8b82c589a6 SHA-1: 7c9478b12a85a0c3dbaf45ca069f6919424122d2 SHA-256: 0f7c3fdb535f94072b5b39a9f7b49905bb5781b4dbdfad14ab3bf1ef53b2dbbc
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, disguised with search terms like 'pokemon super mystery dungeon download'. This suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further stages of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=pokemon+super+mystery+dungeon+download PDF link annotation
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613959e448066---bazazivaka.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/76671794661.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/voxefawoburifomesile.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/weposanemironavisipetu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140e335e6bd6---nuzugupeb.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/lorifoge.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/susowuxixas.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/pufujopigajorexezi.pdfIn PDF document text
    • http://roocenter.ru/upload/file/nisiwavuwenozisivub.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c0e067207c9781b0005a263e3bc504df/56514914769.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5514283636.pdfIn PDF document text
    • http://trivio.it/userfiles/files/62764780322.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7ae83168---vedogapasugogis.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614459a2aced1---kobujime.pdfPDF link annotation
    • https://atiksigorta.com/files/tumotuwozofisodalokebo.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/vojupumazotojevejanosole.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/79654501507.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/xaviwotuxukezego.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/jusogejivepalasusonane.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613222122917b---14034548330.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/totomozajis.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/falaxego.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/selonuxo.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/lupifa.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_off0000cf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF25 17724 bytes
SHA-256: d302c1fecd4afe95f0baf0b1f6e06efe890e8e13b4d415e36b65142f7e5fc013
font_01_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 11036 bytes
SHA-256: 4c3f905b7f861a050903cfee0f2ff87e4358099ff0282ea55a43a82bf2b60138
font_02_sfnt_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1