Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fa1da4f21b71ac…

MALICIOUS

PDF

86.3 KB Created: 2021-09-21 13:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0de364a4c3e3ba8655facfb4e6762831 SHA-1: b255ed6ab0f46f284bae9240f9c3b279576b94ea SHA-256: f5fa1da4f21b71ac5c2b33ecd1b958b5c20cfd0d676a2ef49a276f6a468cffc6
164 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. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The presence of numerous unknown URLs further supports this, as they likely host the actual malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://perfumes.dropship-tracking.com/userfiles/files/xutetelapafipokopumo.pdf In PDF document text
    • https://paidionresearch.com/userfiles/files/39272957432.pdfIn PDF document text
    • http://meskerjager.nl/media/files/wuxoj.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/zilobitisuvezomapuret.pdfIn PDF document text
    • http://tecksco.com/upload/files/zavutukibif.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/zumid.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/76835536770.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/duwutawaxoj.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141819008f0d---vifixusumepupaxunaroga.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/nidesomegepetixezefozopo.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/65269144555.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143e05b5f282---sujedikilif.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zolapakiwuged.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/17930071121.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/tukejubebetejotenatuf.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/27530446940.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/wenumorepegaxani.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130a6d71706c---gakujajuwirikuzu.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/wanofabavilodap.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/73964379470.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/19378855646.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/68641207762.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/28235725358.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614513313aac4---mefonadajunawepiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=galaxy+a20+firmwarePDF 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_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 18580 bytes
SHA-256: df554b155b45a1d438d8f76c655274bc675cafcb8c42515575211dbab6b7f9fe
font_01_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 10468 bytes
SHA-256: 24d83c6d0f3ddd1cacf6354d87e215f7e1f7c4241acb98cb3b3c94d81aea21fc
font_02_sfnt_off00013357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1