Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8d7650ab258ad7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 22:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b60dfb20d00d8f3bb9323182788ba877 SHA-1: e073638c4871df7235bd46f7b4d6b24f1d4ac33b SHA-256: dc8d7650ab258ad7f7bb58c37b399e2217db9b0883441b9d76791d9c41a3f135
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or facilitate a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://etenindex.nl/images/uploads/58994766744.pdf In PDF document text
    • http://betonkeritesek.eu/Content/files/21289422446.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qkpbe7r1utdehecsoqhja1agqj/92085760249.pdfIn PDF document text
    • http://dominant.name/userfiles/file/47304256515.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/gemiwuwewosotad.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/31911340324.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/64974961126.pdfIn PDF document text
    • https://slide-bearing.com/d/files/13764007512.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/1006973750.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/66818875553.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/59656822711.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/87929496091.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/vujigisijudosebegutupep.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/boxag.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/zusilupojaf.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/67192487894.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/41291878383.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/merowatufavopabi.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/75262555878.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/r7j0fgr5cgpb6fdtaf04mhma9j/78949137685.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423fd40b6ed---pepilatemasa.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/demajifijerirog.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/14246834795.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/83718163265.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/73772401794.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/bogitepali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=green+battery+apkPDF 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_off0000d490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 18400 bytes
SHA-256: d8176fb0dac9a6829cb498b71abb372fe1073d6446ddc31c90bfc2cb4288ce80
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 10204 bytes
SHA-256: dbbb339c70abae2311fab2ea8a531897a3d8142b89bef79d0464745783505590

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