Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f704a33d416f71…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 04:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e300dd3e067fdd77a5a0b5c5ca5709c7 SHA-1: d85331f52ad367f4bd2530a060ff1e0f0ddc09da SHA-256: b9f704a33d416f71ccabddc376fab7af407d56025ec6f0da8f5e35a4dd282b89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=phonak+marvel+hearing+aids+manual PDF link annotation
    • http://madonnina.info/userfiles/files/pumafopudugajodol.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/43710282642.pdfIn PDF document text
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/rugebemenowivopul.pdfIn PDF document text
    • http://canionglobal.com/FCKeditor/file/11473094093.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/derigafiduwu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/sazovitibowazudif.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/zolomizuxeripavukajuwud.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612598a728285---19587312116.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/lemoliveromopisixawabipeg.pdfIn PDF document text
    • https://masihpt2.com/contents//files/kenaseruve.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/82818423492.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc0aeee1aa---zixoranoko.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/zilufaxevuluvugolobimof.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/pqf3k4l9iedbm7686uhhgqqq66/jefolujapejevotupevene.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/relitexikotepamojebom.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/sidoto.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/49149195603.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/xagagor.pdfIn PDF document text
    • http://ccsl.asia/files/89156016027.pdfIn PDF document text
    • http://fatename.com/uploads/files/202108221043094566.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082315fe37fe---mavew.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a2260cfdf5f33d37dbcb71b24772a0f5/66470480329.pdfIn PDF document text
    • http://fkhd.cz/data/img/kebawepumutiwinadegadifer.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6185d274439e063e9527f09731f44f52/22815591318.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_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 10856 bytes
SHA-256: 491820ba7ef6901d111d52e602ae1928f037f56a28b5c39ccee42511e0610d2f
font_01_sfnt_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 17188 bytes
SHA-256: c26c7be1b339644fce849ac2add75448c230415f4a6d66483285d633e997aa06

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