Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2677b044c55b805…

MALICIOUS

PDF

86.2 KB Created: 2021-09-02 04:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df156687358b8629f99f881441c8ff31 SHA-1: ec68aab8dcb421e905414469fbf93e17aa5eb0d6 SHA-256: a2677b044c55b8054ba398a3f76bb3373e75855640249d3a14d9ad7f302a951a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=subtraction+sums+for+class+4 PDF link annotation
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161109afb35414---36737340955.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/dewumefuto.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/3ae9d4432a6252a52ce731960373b88b/62232216572.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074335ca1db7---xogan.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106a65c2bc32---83598739954.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/19513689500.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/gatidowixodurejupa.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1cbabe12---gadujebuzojer.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f7f699d86227fdcb663cc4b1f7eb8c56/35534669683.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c33fbb4ced3---25648208569.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/selakijifutavemofogud.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/90104140066.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/biwibeniligodun.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c47409b46---16475823735.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/14c2ef6953919156d9700e6af7c8f083/xofoxudetonusemux.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/32296019833.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d3e0cb855f44cfc3d99ead76dab3bcd3/97838809323.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1a94bddf8b812078ad128b74e162b47c/livujasepoberi.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/siwalamonu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa66c2465b7---40710785990.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/26034192650.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/24734258506.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/71470506684.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/7056159082.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_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 10756 bytes
SHA-256: 06aed2971062b277eaadc38021ba3d80acec9c055d057ab980d73eef7b8b344f
font_02_sfnt_off00011cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 17956 bytes
SHA-256: 67fd9eb7007cd5e9afb5ea9f1ce0fff8c17446c70eff88715f7aeb2cd7bec71e

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