Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ff5fe758e745b1…

MALICIOUS

PDF

71.6 KB Created: 2021-09-07 07:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a50a64f8e891186154cdf1394653c18d SHA-1: 9b9978c80bce60366923261b0d8767519ef24d73 SHA-256: 40ff5fe758e745b1e9c059f42ad7ce1a1e443ae1c2bd48374bcc7a7f2b76af5b
196 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. The heuristics reveal numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 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://pistant.ru/uplcv?utm_term=kata+karate+shotokan+pdf PDF link annotation
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd78c3c1a---simegokepa.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d354477a72b127b74afe178292aed10d/kegot.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/18181903045.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/12572712489.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16083e140e9e0d---sagusavegoverumasum.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4419297e---vowupafivebipomizej.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/mupewasinetejone.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/58720392.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/gipikusekenefa.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/dijolafasilevopax.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/27563r7en07ggncjf04hha4vq5/57820911222.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210803180206.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/89442869461.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/30704985773.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887c36c14c4---juvimujevurisikuxozevi.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/aff13de601dd5413de2e545503220d7a/xesuxatot.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/88621078328.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074068f9ea3d---merapesajosizo.pdfIn PDF document text
    • https://zzhqhi.com/d/files/sajavexelonuzapiver.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/83d2212c6fa13d8973b50d27c8debd1a/meredibugepuze.pdfIn PDF document text
    • http://apcmagon.com/userfiles/47610202252.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/tabujofex.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/1639856feac47146e140521cfb02d698/lazaxazupifalerosakoli.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/52883235031.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/poritaxagesoweripudifam.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/80150835201.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_off0000b906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB906 10540 bytes
SHA-256: 3866c5c3b0b83a85594a82fdac0e237d937c3dc3a6318dae87de1e35aa467a00
font_01_sfnt_off0000d102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD102 15824 bytes
SHA-256: 311c7e37159dd9e1290493f6bb44ee37fa273035230b3780dabff1f3a98b08e2
font_02_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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