Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e487535d4c35b4…

MALICIOUS

PDF

83.6 KB Created: 2021-07-19 03:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58e2f131c340324c64ca65efaa2b9bf9 SHA-1: 21eaa1e0d9e67db9054550a37dd195ea7f8586ee SHA-256: 85e487535d4c35b4bec9f9640e9a9cf52a6092f79558db69c4b556d307c636b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to disposable domains or compromised CMS upload storage, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://rkdestate.com/userfiles/file/tofudakidakeruxarudake.pdf In PDF document text
    • https://areicon.com/images/file/xisawitudajugisonam.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/3538396394.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210629051957_j6ifjn.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/41233526619.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/80307807616.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/82432149320.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/pivajoli.pdfIn PDF document text
    • http://prosquash.by/data/25057432938.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ce0f356fa---50746710280.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/mogalosajininabaji.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/gesulonefewawizeriv.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb40c1dc9---nimewal.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b0a452121ade9d4f1788786a5b127d0e/54578163206.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/nopiribolon.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/zuwokuguwigarod.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210502124439_248651742.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c1d72e9e42d0f97370c8e61c015a71be/jabomitawaxaweditakexat.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e829931a93241af9b46d36b9457263e0/5896986608.pdfIn PDF document text
    • http://lottfamilyreunion.com/clients/878857/File/senus.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/vijuvizumurigulavumunej.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/54628765403.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/pawafopoduja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=meaning+of+found+ofPDF 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_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 10212 bytes
SHA-256: 8a186dde43f468610dcf99261f273ae21e333d67a3766fbaec2ade51c76b83e3
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 16300 bytes
SHA-256: 14a75f4c89391bee954b8defdc164195f37eeb5071f05291df972347148efb8e

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