Malicious PDF — malware analysis report

Static analysis result for SHA-256 00dc1c7e48f8afd7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 01:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb5a0a179feae72fadd3f86ad3922e38 SHA-1: 4d702daaba56c612fb9a4c7d7566b46b2ec1ba0e SHA-256: 00dc1c7e48f8afd79351312669aa0f67bfd012d461a14f6eb07b34358acf6164
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the linked content point towards a lure for downloading potentially malicious files or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=black+wallpaper+apk PDF link annotation
    • http://paradoxine.com/upload/files/matawagematatosut.pdfIn PDF document text
    • http://elpijisystem.com/file/53807017965.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2377f4de---81099793496.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210902003124.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/48816055927.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/23126085845.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f977d893c---71896665333.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109090106046023.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/loruzidamudupexomifupuxuj.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/mutafodu.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/gumilozupipanisiwur.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/8oadn6p3tgeuvvt3lndois15vb/maxigokuniluniludibifes.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/95252338979.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/sewegotujavuruwejabed.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/7673174655.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109062237084337.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/33280333154.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/pepelizamowalejodunizav.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/22396012867.pdfIn PDF document text
    • http://montesantangelo.it/files/files/51139256273.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/tulapaweboxawavofogipopor.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/tifado.pdfIn PDF document text
    • http://hanauhrova.cz/files/fugotogaloref.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0ab875b7---94385716089.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_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 19428 bytes
SHA-256: 22477acb66d3566eea251d741c48805ab4f26022fdabc6da77ee3b6512b15b98
font_01_sfnt_off00011469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C80 10016 bytes
SHA-256: 5d1c70bc9775b43d521917954c126432fb873e84dab7c8928c72d6c8fad54d20

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