Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3563ef1a7c5cd68…

MALICIOUS

PDF

95.2 KB Created: 2021-09-01 00:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc7725a6dc9393def8f3e47c2cd5c6d9 SHA-1: ac5bc9c90de0409fbe232660e54934e00aefc160 SHA-256: f3563ef1a7c5cd68fe9cbe7f7c06fb78d1a6f0bf15073341b92e548e3191d5c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting. The presence of external URIs and the nature of the link farm suggest a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://fly.no1-yes.com/userfiles/file/16562790678.pdf In PDF document text
    • https://best-label.com/upload/files/vezewori.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7ae2e160c5d8a58135d157936456c59a/gofexijinikuvagasobe.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/g0vja509ao8ctjgutae2cftk8g/bimapawupev.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f74e32a7979975fafd8dabb7052381cf/zolixaziwazitorebujamafe.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/pobagi.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/poguxurov.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/42941134758.pdfIn PDF document text
    • http://sdes.in/uploads/vuranike.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/96253083101.pdfIn PDF document text
    • http://unsersohn.ch/images/file/sovuz.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20216263729.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/rotamotilifojunisujuw.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/228bb659594899aae91c235a8cfcadaa/siziwuxupudomebi.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c6698h2t2dmfrcm0m5up0gjf5b/sudaneb.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/44864346442.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/zopojowinoxugutev.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/98509718184.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/sikilofafosonegisup.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/8273396446.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607518025512b---gipifanigepelamuzipir.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/tafoketugumobuba.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b29783ea---fopiretukunosepibiwolaso.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/71848800319.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xejuve.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/siwavopotelijutazujuxafez.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8f9a1f331---muxemij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+meaning+of+adversityPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 10900 bytes
SHA-256: 151038b2f58d9545e15ebffb02f21e4690a759df5ab9afb7c6b598661ac2f696
font_01_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 23140 bytes
SHA-256: 3589e8d405d082389ade1beea8bf02d81cfe65181755151833119a0868f290be
font_02_sfnt_off00013f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001572d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1572D 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426

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