Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef9c45a8ecb426b…

MALICIOUS

PDF

95.3 KB Created: 2021-09-18 19:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d2c2f33f3f171165fe2c53ca55e21970 SHA-1: 81d763a3bf7af6ecdfeee2a88770474226ddfba8 SHA-256: fef9c45a8ecb426bb8917b5850398c474394cc52a7db7a655a835b62b25387d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://garantc.ru/userfiles/file/sisesujemokewexam.pdf In PDF document text
    • http://mylodge-naoshima.com/vabulebakibibugiz.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/jilijunuzigemudof.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1841cab25---86208018421.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/ludowogilirupekafit.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/niliduvebevipotutovu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa63752c3---komozotivan.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/55411178201.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/54353334332.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/jorixu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0aacabea---41297162068.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/7341866824.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/donoxanuworu.pdfIn PDF document text
    • https://esz.jp/img/editor/files/vekivajoxufuwalorekozalit.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wumanu.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/kexubane.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d5c5fde8---bufal.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/bikotugaji.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/lujifunifopisesedos.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/84604488880.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/80788989613.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/24880981163.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/82959958053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=idm+crack+2020PDF 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_off00010dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 20180 bytes
SHA-256: 1d8deda9695daefcc37b701f0dd32accb0ac6013ac60d186c86b99a607305cb9
font_01_sfnt_off0001419b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419B 10056 bytes
SHA-256: f37e932156f989facd2572a3126b70130e34610d8c5e9f60d2a15817fc84e5e6
font_02_sfnt_off00015809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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