Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddfdec976a07b41…

MALICIOUS

PDF

89.3 KB Created: 2021-07-30 01:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 238ea08539a851b296291a300dfbbc65 SHA-1: db6e2d7334dfc6ff3469ad3801e420980f166f2d SHA-256: 7ddfdec976a07b4195ab7b460a6baa433e423b4eebf34c199afc2e407d69a49f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://philabc.ru/uplcv?utm_term=roblox+mod+apk+unlimited+robux+2020+download+an1 PDF link annotation
    • http://biomassasia.net/data_ed/userfiles/file/jagulinum.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb9ecb3fb---54846798589.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f0d9c50367035f2829c55fe93cf2e009/11748882157.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/29486431050.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/93c54504c47ce119e9a90f233edc5c6e/redalogowukovuju.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/xuzaxofuvakotato.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/3681378740.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b770d11812f---76633626266.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5254bfcba---47401318233.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/806ad622d97e8a23d379f2693c3b4568/52974015993.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/losibifijedevodexig.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/2742761716.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1fdcb910---kebosafovuvunovoviv.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/liwigavogosaliwekul.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/22209095099.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a883b77c4---53707366917.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6b75300ee59959b219960df9949ce907/laxig.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b870a6b9dd5---rimanozizaziruvuru.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/90058916286.pdfIn PDF document text
    • http://thongthien.vn/upload/files/29526525284.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec9bdf309---66454582331.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/bixuxexawomilutuzekel.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/mupadanapop.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/fotoguzovo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/86304733f1a9cdf50286e2da1310082a/23926747140.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/32f3a2088ed1341c669d5e37e57c027f/nujaburixoped.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_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 11244 bytes
SHA-256: f25d8f7367a421fe453d7be43685a63053a177b7eaf3682b991e524017229a0b
font_01_sfnt_off000112ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CE 16672 bytes
SHA-256: 51121094bd21826fcd2414e31818ac52bf4d1b02d86dd8408cafd87753f921a4
font_02_sfnt_off00013e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1