Malicious PDF — malware analysis report

Static analysis result for SHA-256 2086e2a933aab542…

MALICIOUS

PDF

93.0 KB Created: 2021-06-30 12:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 6dcfec13439d05b15d3541568b8f9829 SHA-1: e1062e30c90c113c737f3cdf4b2ff5d1839fc702 SHA-256: 2086e2a933aab5425e7649b2cd5017c8becab24c6d59c8508284bd7bda204f33
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or credential harvesting attempt. The presence of a 'download' button lure further supports this, aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/24cbcffe2f5c38c122f80cf7a9525509/voguwogotoxumilalat.pdf In PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e92d391669baaf9b09aee9c0b8f54e67/vorari.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/88986537680.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/dg7mkqbmqfi4vgf082rkvan2g5/xomuvefanav.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/10741228949.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gilesebokedosufa.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/98216031485.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210625_095240.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083c15a755d4---49535056092.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077742589391---lovutejudu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608477322ca76---kosabigozuziwagamufaluf.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/50752009421.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607743096b387---modilutimagekuwetofitokak.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e842060128---sararojunizagarug.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11a9d6d9bf---19744188659.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/sadusuleko.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eac2e98d4---70297364464.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ed3c363e---10074188021.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/92937439753.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/26937882854.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/gga8otgptnqamsvv4c8qv305g4/naxome.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/87345922957.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/butobufidoxidonamimugomef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=avn+in+sickle+cellPDF 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_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 17152 bytes
SHA-256: 56ced6caee40d141c4086b719ca51854acbc77925c520cac8f1ad434a7e872f6
font_01_sfnt_off00013937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13937 9880 bytes
SHA-256: 9532dfcbd65c6a3a71332f543bcced2109a6ca6bd591680f28055f1bcc865109
font_02_sfnt_off00014f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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