Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ae22bce7decc36…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 04:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3eb3c07c80f342dbf22f0ceab5bd67b0 SHA-1: 8a1492624411c318c37c995e28b741f653e7a1f3 SHA-256: 22ae22bce7decc362787b9a2035db4d773b98f7a856832e8064dd0809b164a65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a PDF link farm, with numerous external URIs pointing to potentially compromised or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the PDF is designed to redirect users to malicious websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=secure+folder+on+android PDF link annotation
    • http://moscowprice.com/content/xuploadimages/file/28864982892.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08e30ba7e---7478757554.pdfIn PDF document text
    • http://metabolit.ru/files/file/vovegovebuzumubizizanim.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/71024309658.pdfIn PDF document text
    • http://yongqingtech.com/d/files/2113233877.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/guzinufewigafuzameka.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/lakevokemoxeweti.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/93648384544.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16147047a53064---75632489294.pdfIn PDF document text
    • http://osakadentalcare.com/contents/files/58155349486.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/24482235264.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/losifanoseletijog.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/lusen.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e4567c1cd---18151649199.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///waludinejekopuxon.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16135b427980ed---26626848883.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/zopotefa.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/pekemiwixufafoparuket.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/pifaxefibuxut.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/84466153237.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/49737161211.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/0c52c953b289f4fbdf475e6c2d0d8c39/tixakavofezefozujuto.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/34357897457.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_off0000ce77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 17124 bytes
SHA-256: b01857bf3080f53f2a9ca8771f80be65d9b703b41081af9560cf790f1bf19e0c
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 10380 bytes
SHA-256: 7bb42b57a0f7df4d498ee14bbf14f2bad9e365e18f2f7aad5140118f01853b70

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