Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece80a3aa3759dd4…

MALICIOUS

PDF

101.1 KB Created: 2021-08-05 05:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84df8f5b2743887307b95b4c655cd087 SHA-1: 1b1c2f5f2dec93b3fecb669a2fe1389922e3aa5d SHA-256: ece80a3aa3759dd4b364da1453ee5adc998f3f186a877cb992a69bfdcc8ffc48
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 https://wastran.ru/uplcv?utm_term=listening+comprehension+passages+with+questions+and+answers+pdf+grade+12 PDF link annotation
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d984aefc8---78225483622.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/80020902245.pdfIn PDF document text
    • https://tsegypt.com/file/sedova.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/kovanigubineg.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b82e1d46d15---pakepozebonekojageba.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bafivanukufobemaruveje.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/177677c05c0ccf962ee1c67c058ce2fb/32360834193.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/zifozozokedela.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/siwemod.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/66130235245.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7fb10c61---64740467163.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee250a29b---19158167441.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ea32d0cf7bbf097f1504e80089dffc8b/jujapo.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/44210298056.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/42432132909.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/74090103751.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/81678356761.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe4fec690---48208737045.pdfIn PDF document text
    • http://hasyo.net/files/file/34191957558.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3ffc6667---bovozatosogowukevumika.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/3799256370.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/16553225783.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e00f6e14ece---kuxobudokamofi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7da69728c6---josaxidojupurikirexe.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/25389821803.pdfIn PDF document text
    • http://keramann.ru/uploads/files/2752339140.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_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 11480 bytes
SHA-256: 8de6522c41159acaa3ac64dff63bf31c0d84eb63b15f0488978bbfd0af72abbd
font_01_sfnt_off00013b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3F 19468 bytes
SHA-256: 0af36dfd21ad5557206652d2b32bdcfe5db77baeeaef801ef39e21d7b6d2f1bc
font_02_sfnt_off00016d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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