Malicious PDF — malware analysis report

Static analysis result for SHA-256 930c96b3057b486f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-28 17:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2da27dcb0557b6341278d540ce289a5f SHA-1: 1b1380b74c5b19861f6ca178ab61dbe512f20247 SHA-256: 930c96b3057b486f9cb21a2ab291cd23d1c833fdd74fb80d2a9a1cbf8812200a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and link farms, some hosted on compromised WordPress sites, indicates a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic specifically points to a pattern of asking users to call a phone number, consistent with callback phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://nomylo.ru/uplcv?utm_term=for+security+your+phone+is+not+allowed+to+install+unknown+apps+from+this+source PDF link annotation
    • http://eco-building.cz/UserFiles/File/naletogoduxalob.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/bonosolinekojigirejok.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/wemudeveturalovonepe.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/rikiwatokenemomobukekirob.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/zefifakajesotapitubafev.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/tofomapader.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/zerukidozategatu.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/monow.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/94818806110.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210923183124.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/74743470675.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/pipulari.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2e8d5b9abd3429221af66484ef8c0a23/61443906186.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/af2bcghhkb43tllblirirc0799/64493971207.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/6277702395.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/20387663356.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d065a88f8106898aec9a25ca1a9a1c9b/molipamowug.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gorifagedu.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/19880351472.pdfIn PDF document text
    • http://snft.ro/media/file/46652203214.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/domodijoxi.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/nopirowebuwo.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/73164460398.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c191058f1---ranunuvanotiwi.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/rinekegemif.pdfIn PDF document text
    • 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_off0000b568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB568 11256 bytes
SHA-256: bed3fc491de4624e1d18d0fe411b6bf5ea02770c95721aa0ca44f1afb6ecca1e
font_01_sfnt_off0000cfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB0 16208 bytes
SHA-256: bd22bc2471e0059bac0db6f70a34beef0c2b1437b63b9d3ebad46dcfe41b67c9
font_02_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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