Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2133279089d9f20…

MALICIOUS

PDF

131.8 KB Created: 2021-09-24 04:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 164b775d154d20084cb095879d98344c SHA-1: bd6a62506e9ab8dc08f95d970872584d06f48a2a SHA-256: d2133279089d9f205286d58631dd2609e5b47c2eafb59ed8a58a8afbc1928562
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attempt to redirect users to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=scaricare+gratis+giochi+per+android PDF link annotation
    • http://albino-pitti.com/pub_img/file/67009924491.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/25215442645.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614214b23e4ed---juzetefibonal.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/tomejimujekerijazako.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/47325549435.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/kudez.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87dc92a70---36410671245.pdfIn PDF document text
    • http://velisend.ru/photos/file/sosikugevedugase.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/masar.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613357addc710---zusutawiwozemudifin.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/pupopipapizu.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/23979562498.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/32917655141.pdfIn PDF document text
    • https://cargobull.cz/res/file/fetuxolikuzojiginuwoxeli.pdfIn PDF document text
    • http://lblussana.it/images/file/56590780235.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/379778981.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/vamifaloxegagamarewenif.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/32517855581.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/28428687406.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/27628056625.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135a88374c4d---13823300370.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/jeriza.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/jebefovevajagumiduvedi.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/kotuvakoguzutedipoxer.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/dijutojuliramuba.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_off0001a148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B95F 10824 bytes
SHA-256: c1ef374b45e7fd7ad6c07f2326932266aadc7daea9abca98dfaa15a261840205
font_02_sfnt_off0001d20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D20D 17916 bytes
SHA-256: b5951133e352d2fd6de66ae67fa096e73e5f0066212fc9e8876db0912c8bda11

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