Malicious PDF — malware analysis report

Static analysis result for SHA-256 57478b9463fba87f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 12:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41a75be8f4de1d4a142f273efea196bb SHA-1: 5bc483f936b897a6f1fd22ff712f66ec1bb0e0a4 SHA-256: 57478b9463fba87ff9c62f089907bb3867d53cf8fd8181ef3cda25f414d185b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/58a42c0ecc82cfd661e2722ddab003fe/mowujusojepivotunovupovu.pdf In PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/52760727698.pdfIn PDF document text
    • http://beateromer.com/bilder/file/bubitanamalozapelitog.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/dobamazurut.pdfIn PDF document text
    • https://signika.pl/Upload/file/72867207023.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/rujaxinumijatudiwavumal.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/56235623037.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210625_173316.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcbb9cb96a---wefatuzetenapobakabiw.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/74477372653.pdfIn PDF document text
    • http://emannsltd.com/userfiles/risudizelus.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/jimalubixunuxum.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/wupajapof.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/makupemegikaninowinu.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/bawejoretaxafuxatuwotaru.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/jovikipojomobi.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/acccce3a10349cba52358ceb7089bf00/19086642433.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/60072037369.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/690a5700d5dc5edcf7636f63de5cc0ff/sinadeberepalove.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108d7f4e5d08---sibenadipopuk.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/zuzukuvarezumodifuxejin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=possessive+form+of+nouns+worksheet+grade+5PDF 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_off0000bed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED9 17768 bytes
SHA-256: e5b07d9b129e67460ac7dedd0b7f8d23e8c4e47f47c849cedcf01b20a97e601b
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 11232 bytes
SHA-256: 8f7d2304800e9152def312896f7815c7d3768c349dcef1ebc15e2cbb2a7106e5

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