Malicious PDF — malware analysis report

Static analysis result for SHA-256 f338aab3ba56d35e…

MALICIOUS

PDF

75.6 KB Created: 2021-09-11 03:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f857d7d069f94c585894473948fadc25 SHA-1: c5fd1475e1c2a27f97b5a98690be8b5efde69bbc SHA-256: f338aab3ba56d35ecbddde90564e3cb4a5cf431b498c70cf8a2991c1a2031b27
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of an embedded JavaScript stream further indicates potential for malicious activity, such as downloading additional payloads or executing exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=speedometer+google+maps+android PDF link annotation
    • http://yh-nutri.com/filespath/files/20210901063142.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132563230ffb---65803574128.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/tozoxexikotiwo.pdfIn PDF document text
    • http://chieucoingason.vn/files/70841624163.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/wedowufer.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/polexul.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/38816973997.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/9165726518.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/89417009332.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210903_EC7381E7F88C6E3E.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/70595275209.pdfIn PDF document text
    • http://mfahk.com/upload/files/49672916873.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369d04542b5---novelapaz.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16130191a9fb71---renot.pdfIn PDF document text
    • http://liily.jp/upload/file/20210902081432.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/dilosenukujo.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/53883171535.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/vexirarukovarodorurumib.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/86881169229.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdbb7941c1---43791435289.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/bofejubokizafakememobujas.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/42316957398.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/62788220495.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/fawesomexibuxogifojanumo.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_off0000c5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 16432 bytes
SHA-256: 07532be1970e28257ac1f041dc1fc9b74385c8c654b1e8307e09500adcace668
font_02_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 10812 bytes
SHA-256: aa78c051817e2f7fcd9ca25e841f50c11a812c883e82805771776b7b64133bf6

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