Malicious PDF — malware analysis report

Static analysis result for SHA-256 de22fb95ba09f452…

MALICIOUS

PDF

84.6 KB Created: 2021-09-30 10:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 80df376c01c1c26fc6bea7cfaddb66da SHA-1: 492198dc698e2fab1f9594440f3befcdd1fb53ab SHA-256: de22fb95ba09f452f87b4b85ddc743941cf71bab066f216362ae32b5920b6646
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage or disposable domains. The embedded URLs suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://ambalatender.com/upload/files/75136131603.pdf In PDF document text
    • http://euromarkcreations.com/new/fck_img/file/wilabaxofumavotiwiwugodo.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/fikufenuvumopafu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161411044208f6---9304165517.pdfIn PDF document text
    • https://fobh.net/userfiles/files/wujutekusudizuzofab.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/47661434721.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/88052612864.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/67893867138.pdfIn PDF document text
    • https://salwangurugram.com/files/12789093303.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b87bf19aa47b24c31de978fd03753750/87976784482.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/kogexejojebobare.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/26913676440.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4338ad70f---gubanitofupukunumoz.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/62053754991.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210911123821.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/xugipap.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/jezotaziwalirebiwelese.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/mibidikulifol.pdfIn PDF document text
    • https://zzwgjx.com/d/files/jirinogeno.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/wemedesadaze.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/46645820645.pdfIn PDF document text
    • http://synphabase.ch/upload/file/14450569089.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/zafut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nice+bangla+chotiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 20224 bytes
SHA-256: d7819d707575a4bd1dedba41232bc1ddde64a19187f5811c53d34e7512dd5fa8
font_01_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 16364 bytes
SHA-256: 0feca032aed51f046e9caa67816571eb77e5146b836e7fe6a16dc15a194388f8
font_02_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF5 10360 bytes
SHA-256: c5aae50cc72fcd4439f86441b8d9c1ee67c43e5aa0ff1d546c63fe979570364c

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