Malicious PDF — malware analysis report

Static analysis result for SHA-256 a352e372197d7c24…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 22:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e68f6a5b9eda0d6291c94ec28c19a75b SHA-1: 974705114b54739156a13807a0e663565234156d SHA-256: a352e372197d7c2491fa30c91553597e13b2b10c8144690ad538402e976a206e
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to improve search engine ranking for malicious links. No scripts were extracted, and the document body was unreadable, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4749

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=reading+comprehension+pre+intermediate+worksheets+pdf PDF link annotation
    • http://ibtaker.ps/userfiles/file/varepafiwesaruzel.pdfIn PDF document text
    • http://armanetti.com/images/89191030122.pdfIn PDF document text
    • http://katela.net/userData/board/file/vevevumozupilil.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///88257223451.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109160954431343.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e17dd2228f---sixomutixukipot.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a706339f2c---viguredo.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/kodorepelegokapozolam.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b557b2f58---pofijunurulenakitovapisan.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/96829724953.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/69083174290.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/bepuvexufidubavewe.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/doxerixevagab.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9590ec29add28bb833d31207d76745bd/rafevugunezeka.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/giwajojamupunevetuwu.pdfIn PDF document text
    • http://446888.top/userfiles/file/51812994393.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/nirinimowefivekirifogilej.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/94169643971.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/fod9ji822frv36mekaelmd8da2/93326322901.pdfIn PDF document text
    • http://turnyras.lt/Files/file/71373386322.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/22832805735.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/nawemapufa.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/fae0e7a9f787f9361b3c0466f8d0c12b/8792569133.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/depuzato.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/dusuzad.pdfIn 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_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 11244 bytes
SHA-256: 12de413af82ae88e8f39b93c17e98661f7951d38a8c76b15cc5808aa25de781e
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 16552 bytes
SHA-256: 4c092732c8275fd4c779223c48e83d5d1de338025e7cc967823a379487afd73e