Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff8b66055b8b20d…

MALICIOUS

PDF

74.5 KB Created: 2021-09-27 00:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2db756ba6f7c06643976f2050aed3492 SHA-1: 5dc5e41a91aa085bc18e460ecdcf1597389835f6 SHA-256: cff8b66055b8b20dea42f7ee97ae2be0323482ac2a4e9eb0bec1e39ee1fc6331
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/bumasawunijuxiv.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614509c334094---vomobirewozogafovufu.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/3432291964.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1f7deab4f1020d83426d8a1335a150a6/95057132160.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/mowakugexinakuka.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/tukabuna.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/70015260358.pdfIn PDF document text
    • https://digireg.cn/upload/kiwurepatonakumimad.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/setuwuk.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/35349739034.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/kokisigamabifo.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/xarujizat.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/sijivesinawuponiwazusa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/77274a1494f555559a906733b96e80ce/jerozefodetut.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/37105361948.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/loboleven.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210902_053625.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/xufasenosubogedotovefizaz.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/34242908460.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/wigutubuneramowix.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/266b2197f88a46e17622da6260a1e20f/lufaduzuxanobamisi.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/54711169090.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/86042317990.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/17923997014.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/52118882641.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210921085404.pdfIn PDF document text
    • https://geloracinta.com/contents/files/juxorewuzejakerofidijava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lollipop+rom+download+for+any+androidPDF 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_off0000be39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE39 18096 bytes
SHA-256: 5ec0357623591e30187b90d1eded3cfb288272fe22638491472a14521f33158d
font_01_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 10416 bytes
SHA-256: 9f6844708153f7e1bc3a3f9d569eab2d01fdbdb98de4324e17c3fbbfde45fd05
font_02_sfnt_off00010444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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