Malicious PDF — malware analysis report

Static analysis result for SHA-256 79aeb1643c43024b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 04:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bec3d7db8b047eff75f95fdb39932251 SHA-1: f3095579f317d9d6ba56f5fe541c95172178a44c SHA-256: 79aeb1643c43024bd5e016e121d2cc0faf118d65702fe1119ea1127561ea3489
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://infrive.ru/uplcv?utm_term=g+m+syed+books+pdf PDF link annotation
    • http://palaciodelosnavas.com/userfiles/file/96204049195.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/dagofuravikabufawobalelus.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/54581442121.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f967cfd02b46ac923ded65f74d40472c/zokezumuburufuwinina.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/76773832222.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/29802523775.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/epa2777o3sqldbs84ss68270fh/fudamedupojoba.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/24467801675.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/mubareluzusojipurod.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/op6v6fh33rivph1gafk9bqvc40/gudaluvuwumuwapajiwitotus.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/pusufasajasoxitigomika.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/zewalekobefoxoluvivum.pdfIn PDF document text
    • http://strandedtattoo.net/file/xidabojegomumemunor.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/silejunufezipinazede.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/jojujotijivutemawazafebuj.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/29556272122.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/ranigerima.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/5457828646.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/ruditafobaja.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/96342830359.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/lafomopuvonapizobosun.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r2sohi0mepqdc5jb2927d7s8v0/41798653266.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d639d3017---3909833062.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608389484ba64---12875929831.pdfIn PDF document text
    • https://netlandschool.cl/files/1474205938.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/vigiwidobofi.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/lopiferiwozivalugar.pdfIn PDF document text
    • 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_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 10440 bytes
SHA-256: 8a45765949e64d9b882832628d7217a3390a0dabd51c0553fbaa40f5a6977d7b
font_01_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 18548 bytes
SHA-256: f85cac9da4532a734af1decd73bd970f748a4e1fd5a1c2f9ab74aa6624cf1240
font_02_sfnt_off00012da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1