Malicious PDF — malware analysis report

Static analysis result for SHA-256 d290f0eaf15e247d…

MALICIOUS

PDF

207.6 KB Created: 2021-07-26 12:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d92c846dfb6a3ff50a15bf3f6e6c96fe SHA-1: 6c3cb97612af882c306a5934fe2d9c0f664d5876 SHA-256: d290f0eaf15e247d77ff45707a3de192ac444ff3fe73c6e6990c50d2b1aed613
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the use of compromised CMS upload storage for hosting PDF files, suggesting a phishing or malware distribution scheme. The embedded URLs lead to these compromised sites, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8631

Heuristics 5

  • 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.
  • 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://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a108a8ee8b1ee3929cd42ddf21ca3050/dizorexenezoxasole.pdf In PDF document text
    • https://landatur.com/files/galeria/files/84226272900.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/37540981350.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607abda7dde61---kibofipaxakusojiregifa.pdfIn PDF document text
    • http://bronia.org/userfiles/file/1562674821.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c65a2ec3a51---86210261313.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f733e9716ea35513d31ccdef43d3be91/91566818225.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/18929c9594cd61f9227bd29e6f25ded8/90102049217.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/21b585e0ae70d9361997b9b676d3b7b0/wuvoxavaseri.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cbc6e48528ef0cad102ba30bf16669ba/33967030094.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/gogaropiruwaxofiwazita.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/69415893437.pdfIn PDF document text
    • http://absigorta.com/E/file/sopalatevefogeruvodeme.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c9b9bee7e0d042900006f5507d23ff01/tabojagukifapunuguxiwogi.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210724092430.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a9180961---58251244042.pdfIn PDF document text
    • https://tl-systems.hu/files/files/85258917393.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ba90ddd2---kopoladubizonaxo.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/da1e1b5387028082f87ffeec2ef708ac/mizuvixurokedezojaboxuwu.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/55535557588.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/80849554618.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/099574cde015ba85a25d6f740436a08a/42982759655.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4d8e143c4---zibujamefu.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/84514107989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=umn+morris+finals+schedulePDF 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_off0002c7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DFC7 10748 bytes
SHA-256: 1bc2dbbf48ed641d937ad484d20a0a95c6a6699279967ef186d7c033166cb50c
font_02_sfnt_off0002f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F838 21204 bytes
SHA-256: 1e7c528136361534d2abb58da53a84471d8ab5765e9bb4c5669700fa4572e73c