Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21d8211703cf913…

MALICIOUS

PDF

75.8 KB Created: 2021-08-27 22:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 900588042cfd0a816608e9936c640733 SHA-1: 2a2869721e871008549e7b11ee0665746cb66c49 SHA-256: a21d8211703cf91350696ed9cb3f8c2ae5726d674d24ea3b4bd95842f244dc71
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to compromised CMS upload directories. These links likely serve as lures to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9264514317---xofewanuwel.pdf In PDF document text
    • https://datawire.gr/files/files/91973676855.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/74274540407.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/damawez.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070371e2ecb5---dabasupavafepijar.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/92089511942.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/7703152385.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/64499295070.pdfIn PDF document text
    • https://airshow-bg.com/file/damole.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/wejawerazarimumupazodazi.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/wudufodapowitixuwivuvoke.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca33c3c725---73247901215.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a3ef0594b---58576006202.pdfIn PDF document text
    • http://gibisch.info/files/files/zodesipojijiloteji.pdfIn PDF document text
    • http://arslanemlak.come/file/pipomotumupefisadasive.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/42874390040.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc00aa3d90---zewoxerujuriwakobejoxizi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a82f4b5675---30235456295.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/54688649104.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/lunusuvovi.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/13228913096.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/69010036725.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f3a0661dab6fc9dcf029dd3694f4dd54/31550533018.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079208d05a68---buwanodikafar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=data+gathering+procedure+qualitative+research+examplePDF 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_off0000c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48A 11376 bytes
SHA-256: be9ed96fb6124cb93ab948839ad303d8a4201f4092ed6ef49e9056ef61b016fb
font_01_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 16496 bytes
SHA-256: da8ad16590dcf3cf706f11602319fd699971002bd6b607eecbbfc1e09ba10049
font_02_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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