Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1ddaa8f6aedf45…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 02:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19ee3411e3150893dee3cb6e4e7bc0a4 SHA-1: 86d6915083537dbb1cdf31929491c71a5d76875a SHA-256: ac1ddaa8f6aedf4522c6715ceefa91b2fbdf26b335d62d8c50b1c82c162fff15
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The 'SE_CALLBACK_LURE' heuristic suggests the document attempts to trick users into calling a fraudulent support number. The presence of a link farm on disposable hosting, including compromised CMS uploads, further supports a malicious intent to distribute the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://tiquital.com/documentos/file/82571672111.pdf In PDF document text
    • http://ducnhua.com/upload/files/bakuzonul.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614134f83c306---32822182020.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/kokumudibotulipunoravase.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/komolugevapobizamix.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca9f698c6---32438299853.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/46632087316.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/60774206320.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/911bd464f67f2b420339395eab642048/tusutuxadupafafabirafej.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/51226668744.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/94267433857.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/zaxoperibediwufokepexir.pdfIn PDF document text
    • http://kotolantopeni.cz/file/3407539445.pdfIn PDF document text
    • https://cowik.pl/upload/92846391406.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/49228459370.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/41176609663.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/51913800837.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f6a125627d42286650f223c15fabde06/54092756120.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/52724910402.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/fisomojo.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/jonidapofepitepe.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/57988455822.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/24561821109.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/11242637975.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/88390391964.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/77090340573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=clock+live+wallpaper+pcPDF 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_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 10272 bytes
SHA-256: e7053704caf9e94658fd3405affb24ae1eacae1d246f59f9c672ace2818f7de9
font_01_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 18720 bytes
SHA-256: b61f98ad2f09ee1bca7a828ef49480aba4e2c01d019ff15eb9ac23d2aa298546

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