Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2d56d25e7167f2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 22:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b4246b429263ee473321ef637888dfd SHA-1: 68597d5a5d7f0060b0d9cae2f5bc6d2802bee26b SHA-256: 4f2d56d25e7167f2ff0f741f37650338a6d63e93cfd073dce07ed122fb329b20
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://htchninc.com/d/files/sedatabagezesanumidozot.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2d306ba95d746a5e57f0b19475d44482/31342732930.pdfIn PDF document text
    • http://thegioioto.store/upload/files/vefabiwizuwivigi.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/wonumumefijakazugo.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/73231616008.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/46000964031.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/28985332937.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pipelesufumawugebafitef.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/16236536445.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/69570609506.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/89081832273.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210912094954340438gwoc3.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/70683733357.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/6019837876.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/654d0ea78a7e26aa39ad79a55c815322/fabukutofexogegulofe.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/20669840902.pdfIn PDF document text
    • http://esejsc.com/upload/files/remibapogafudaroxigugiwed.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210909033401.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac2ff18261---mufisad.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/tamexagitupekolilusugo.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/mivobinatulenulawemaziro.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/21376007773.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/dd05a494c4452965a698238c74a3fecd/83027113806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=eml+viewer+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_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 10280 bytes
SHA-256: a3c49928ab2934bf176e25ec4307d5fba99c57fb30657eacee1f6f94e7432729
font_01_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 18844 bytes
SHA-256: ff4f7b73e370601609e25f0d010cc0e6a616d7bb01d051c755dbe5cfecd83337
font_02_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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