Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc8f77d8a5b07f6…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 06:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57a215110228440ccce0d8a64000b92b SHA-1: 0d9e038d67501b959e2a37f971e45e8ebe848f6a SHA-256: bdc8f77d8a5b07f63a6cf820ac21a8bbbd3b7c70a3c830ccba8964e9e5c02c8b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and ML classifiers. The heuristic 'SE_CALLBACK_LURE' indicates the document attempts to trick users into calling a phone number, a common callback phishing tactic. Although no scripts were extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://netpost.vn/upload/userfiles/files/vofavomafulole.pdf In PDF document text
    • http://vipforiraq.com/userfiles/files/tasozeka.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/83eea96e7b3920049864d36f4b1401ed/kopepudin.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/zuzijerokowevuxejaf.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/181952188357.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161010b1fba8bf---22398911569.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/cjv0vvka5gg9doeutem3hha0t7/pofodazumagobekorarifut.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/a4552a56e1501b529f0018e460f6c459/89863662746.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9688fae1e7---86785117838.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/25631867830.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/53649101288.pdfIn PDF document text
    • https://sealskinz.ru/files/file/28084999277.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/kirubuwagesuwiwiniza.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/makigixewib.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b65f99f90c---weramadotivomowarinoxa.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/b7e6fd3304931c5cf7126125d9982b27/90363941685.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/sexewuxukexijufifuxe.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076759b7b83a---37991337543.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/furixas.pdfIn PDF document text
    • https://ottopianos.nl/files/getegagufevowe.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/hqlmaljnb5rtds5hkic0l9bhvn/tezunekubetopuna.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d13b8d302c---9687280730.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/18765229908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=give+an+example+of+waterborne+diseasePDF 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_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 11092 bytes
SHA-256: d4cf2157b04bc6d319bb6a60a66d298e409fc33aee6c04952b23364d139762bf
font_01_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 17884 bytes
SHA-256: b24383e270e66ec04d2cbf5fa082bd1a6bff469a45e0fe3ae4c5250294fe010e
font_02_sfnt_off00013535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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