Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f37af207891fb3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 15:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 53b7258513d9ae1a1a9d89131fbda1d3 SHA-1: 78a130433fb83c2f58d8d3b2dfc1220ff6eba1d4 SHA-256: f8f37af207891fb35ff70144cf639f06e6121a74a031d9df0520950cc72ec8e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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 http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/miratiwetogut.pdf In PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/44509900961.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d88393470---64328872379.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/kumarorawifukaregu.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/46501519156.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/stob6ps0nrgnuudad6khiuhog3/75741029205.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/44924678790.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/25935252343.pdfIn PDF document text
    • http://biomehl.com/images/content/files/lixod.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/30472904913.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/pajubujepeluwegug.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/xurizokadaz.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/tiwazukutisotedivimesikej.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131aefb48115---gukorolexoled.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133329eba809---rixewolixutemumot.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7bbe563b262b09969950be74098afbcd/zivonoroxifetegividub.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/3551486769.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/bibirekomuvobagukamege.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/mimun.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/lilugexorujufagabaj.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/leregaliwirefikumebuwino.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/duxawaj.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/xuregabigijof.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/47809479235.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/babitanapisijizumav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=root+z5+premiumPDF 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_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 18324 bytes
SHA-256: 219a81962137290a689f36877791c568efaa7de556547522a415b6b346e54593
font_01_sfnt_off00011da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B7 10272 bytes
SHA-256: 692e7e7bd809282cf07f2ca3cf5a6552576aa7a4f160d3f31b8a935b7d017c0b

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