Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78f75ca5581fb29…

MALICIOUS

PDF

76.1 KB Created: 2021-09-22 19:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4151cec4d8b8fe022f0ca1c4eb1c1d32 SHA-1: 6feb49245ea10a9c5536a80be3714fec7b0b050e SHA-256: b78f75ca5581fb290ba3d0791c3c3f41bbc844dfe9c3e5229d6b12f9e1cdee92
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The 'Urgency Lure' heuristic, though low-signal on its own, supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ledlight-lamp.com/mingyi/images/userfiles/file/ranalefabinedakevulubaw.pdf In PDF document text
    • https://kermanrooz.com/img/files/96374179508.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161372faf288b7---84299131246.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/bakelaguxu.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/gigibopipejako.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210913100114.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/kukazimoranokid.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/matifavuxidirowip.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///surapakanubozulopod.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/fivemurozelosilafufirojiv.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/66518930306.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/takowaboludekexixuleso.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/fubasuduvojoxogaruf.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/19ea2831100f3685b1846f344855b088/73661330703.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/77138947808.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/80310914295.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/rudagejevunaliditebufuj.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/44014682934.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/kelodizuxebefumupofufep.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/wopibegodonobekakuka.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/53234100947.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/75204280252.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16147d56be389d---bapunefadimerisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lord+denning+books+pdfPDF 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_off0000c32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32F 18432 bytes
SHA-256: 72187c206315724202769aaed5e7acae12f64b4f5b378620fa9975f7eda5557e
font_01_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 10556 bytes
SHA-256: 647155c4d887951640db9ace1d713b0633a849ed8caa7d1c1620c288a07e1560
font_02_sfnt_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1