Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f06063204cafd1…

MALICIOUS

PDF

126.5 KB Created: 2021-06-27 21:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f141f1c9d1fa95f2cf3d4a0ddab1d0fe SHA-1: ef9ed3f3a880313b59bc774e6103f8becb0e4679 SHA-256: 71f06063204cafd147a9d7ee68b28c69a9478983508f68ef93b1a6a9341da2e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phishing pages. The presence of numerous links on disposable hosting and the use of UTM parameters further support its role as a malicious distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087af8d64b38---malerabofolatife.pdf In PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/panawokuxotarosotunobuj.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/porepevo.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/hf48a27vgoedose3eo6qiku1r3/97354477128.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/bajudamutonuvukoledute.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c45c767f08e57c7661e5080ffbedec94/masapuzivoti.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ojtr0b3i3qpspm4mbqedrrifcu/xafazaguwukubaveke.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071652a97cc3---lilatevodibidixuxexof.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160804e69d5508---vozulafonafabazewiganir.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/cf67006980feb17ff311fdea0877c236/sirot.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/72b7438aaf59eee981738c6a085560ac/74342206288.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/vodusenakinu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/66970967566.pdfIn PDF document text
    • https://davaocarrental.com/images/file/xogabipodigogarajoguxize.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab68956f46---rafomodonoduwafasopib.pdfIn PDF document text
    • http://brlairport.com/images/file/togavuriw.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/fnqaff0l6unmvehnnm08t19aje/jutupukuravuvorunar.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3680d177ec1ce9553246be069a38c709/31576934966.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083108469f1a---momojevugopagito.pdfIn PDF document text
    • http://shosholoza.de/file/63430237101.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4ecc8380---46365083362.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607355c3b94e0---bafujal.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/93398553288.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084edbb609fc---97877748753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=brisk+walking+meaning+in+bengaliPDF 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_off00018817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A02E 10604 bytes
SHA-256: 0e469877a5dbd29b378f14d8fa07cb721151f889a7e3b65c82f6e43f5aab846c
font_02_sfnt_off0001b86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B86C 19380 bytes
SHA-256: b6f30e54c0137cca2ac9e551b46c95da227848cdc335f1e0780e19fb4ecae44f

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