Malicious PDF — malware analysis report

Static analysis result for SHA-256 5807b9b6dddef011…

MALICIOUS

PDF

79.5 KB Created: 2021-08-16 19:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a5dc27a8709dc50e7d63a51abf35107e SHA-1: f135742296cecf6f48a0099412a1cd0bc1508c2d SHA-256: 5807b9b6dddef011358c1c3436b43318237660916079a25f864c621fd1e133ad
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, designed to appear as software download links. These links likely lead to further malicious content or phishing pages, indicating a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/1075d0e107ecef7a3f7c0b0c4846e721/dodevoriwegelirije.pdf In PDF document text
    • https://readandenjoy.ae/userfiles/files/75253666970.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/vugapogobakituduzivovuw.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee045a8e9---nibajomasunuxidujajej.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/64146856376.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/73138053543.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/aba1d9bf48119d5e8ddb638076d9ca9d/92261874508.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/wagatewuzozu.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/2550391271.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28e082f5fd---7532161540.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/10149307293.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/vawexidij.pdfIn PDF document text
    • https://ptogel2.com/contents//files/42496955824.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd00171d76f---149418437.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/88089896737.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608600f0f1d16---16044604187.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/dobuvem.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/viragukexija.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac77735c18---pifabovob.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/10571222346.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/80113677033.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/kimepaten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=descargar+abbyy+pdf+transformer+3.0+gratis+%2B+crackPDF 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_off0000cf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 17036 bytes
SHA-256: 54fb5f1b3287838fce7f4365df1fdf2b33d30e6054221780c73aa65171c89c16
font_02_sfnt_off0001136e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 11624 bytes
SHA-256: 5da5bfeca85535c490549f8a7c8232231e19d2e3c347f7bd15e78c9d2893acde