Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f88bbe609d0cc2…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 13:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51c6a36d950b39e077bc0e68f8c01f7c SHA-1: ccb55a9a5454ee2ba930069cb06c84154c111a99 SHA-256: 64f88bbe609d0cc25c29eee95b11a8c342883b4d63f03b253aa19b83e3dc48cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing attempt, where the document prompts the user to call a phone number for a fabricated issue. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to deceive users into initiating contact with the attacker.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://studiotecnicolari.it/userfiles/files/67448639200.pdf In PDF document text
    • https://esz.jp/img/editor/files/14697329898.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kuzabopazagolusenudoja.pdfIn PDF document text
    • https://netpage.info/userfiles/file/dijejomixuduliwalixi.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/97406270275.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/kofokebomagedimesuzixat.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/fijonawiwup.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/39884608612.pdfIn PDF document text
    • https://yuktogel.com/contents/files/58794682363.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-13/20210913160101673553.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaced521a9---xadup.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kazenat.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/virunikup.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/liwopikito.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109060149228737.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16134d16a531e7---88223126043.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/lozole.pdfIn PDF document text
    • http://eventaipei.com/upload/files/74392125481.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3dda2023a---83081326255.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/mogebedibibuvap.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff54d11d59---22132494878.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/giwoteri.pdfIn PDF document text
    • http://palami.by/images/file/fupilekozazaw.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/sixemumagomo.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/mofusudujasibomuseta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tasker+sms+to+emailPDF 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_off0000cb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 17660 bytes
SHA-256: 3008ac2a48469b6e4294d90d5d37d331db86e3900dc42078b9a7cce7877e19d9
font_02_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 10220 bytes
SHA-256: 73caf9f0fdc40225556c8991d3c976dd3cbb9d77c7ee09168965ef6bbc2e01cd

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