Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e28e34477a9e03d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-27 04:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ab6997d0f866f2ed00485a6b741706a SHA-1: 588fb84ee020e738e0f42845f0628f0fc227e78e SHA-256: 9e28e34477a9e03db9c86b319eff992f9f158f4986ed90cbb110c6168189127c
156 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it is designed to direct users to external websites. Several URLs point to compromised WordPress installations, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ec38ea148---70793660943.pdf In PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/dagolex.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/92354300467.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/noxiwot.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091208002725.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/rapavumutopagiwuvekese.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/vikapugebuwafaro.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/vosejufopinuxigepi.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/bubebijig.pdfIn PDF document text
    • https://kratky.eu/files/file/24252122487.pdfIn PDF document text
    • https://lorus.rs/files/78422471019.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/tenadaruverawodoxibipuja.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ufj1ilb9i1bl8f44i27udus804/modiwujozopik.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/kujarufajumimiwav.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/21762894332.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614546f0cb69e---tuwaxawejamopil.pdfIn PDF document text
    • http://sial.pl/galeria/file/sosazalol.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/54271640995.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/wironeketamamolakanifofuw.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/zevezerozadipakanefaxuka.pdfIn PDF document text
    • http://hcpcsz.com/upfolder/e/files/20210926062734.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/53001883028.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2b1a42193---35819147316.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/30940313787.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/nujerakisijavekidebesawil.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614428bde5841---4625432197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+su+pc+vecchioPDF 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_off0000b80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80D 17508 bytes
SHA-256: 3c0a128c462e46854f6e9ca63ab750ece40319a32af1a926dab0f97e370878ce
font_01_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 10452 bytes
SHA-256: 6251e8ffedb240364d82d694cd407fdc70cfd4add243c905ee10331cf07ba602