Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a4e3f06b7edcb3…

MALICIOUS

PDF

85.2 KB Created: 2021-07-21 00:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5be3a155bfbe82214640064f6f14982 SHA-1: 97e8714f182c2a9f553482db1fb1605d6c236769 SHA-256: 43a4e3f06b7edcb3f4647cfe6631c4671e129477371f78d47054d4101ed17b14
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the document contains a link farm pointing to compromised CMS upload storage, suggesting it's designed to host and distribute malicious files. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c961f2ed64b---72335059098.pdf In PDF document text
    • http://fotossc.pl/_files/file/bopejoxagusijusixeroxebe.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/63252b4f124e040f758d9e3b10387352/50742577686.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/28c77e4fc049737d13714f24353091fd/33537891498.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/38217233353.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/fasanosawataj.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/nugikadafagixutotixuxeta.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/49093ec8e689679487c18cf24b543d6c/10095956206.pdfIn PDF document text
    • http://yocarbroker.com/upload/ckfinder/files/33072409473.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/cf83dcbfbc235dddd68ba8248cbdf6e0/reramotarolexowixoko.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/xoraxenobivu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a3aea9aa---kivozusaxifiker.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16090e2d554842---rizewosisebufa.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/novidodolovew.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/mofigelolawijawazara.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/39325680762.pdfIn PDF document text
    • https://maisonforville.be/documents/file/88994974364.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/21579399761.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/lotibekizegonimi.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/55502469781.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/622f88a2e168d4197c3cbb57f6238bfe/zagemuzajilinoma.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c31a48f1078b554cc0a660b47d0d3a64/kesada.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a752052f32f---bujuwegasabalipuvotoraw.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/48613371318.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607657ccd7052---jenolituzemovafirelupawag.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/64142772370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+does+biodata+includePDF 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_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 10600 bytes
SHA-256: f23a758751c9729d9ef1767ad038383f624aa6e69fcf5bd80e017230e4dcc3d7
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 17360 bytes
SHA-256: e89cae3a650e4c6a4f65bc52118658ad69ede755e7dff4243dfaf2044bf85abd