Malicious PDF — malware analysis report

Static analysis result for SHA-256 c547f66dacdd2160…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 04:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eacb3308cdc2d50f5dc59bd0fdd288d4 SHA-1: fb98955ff417c97df623a5e12d4f9bf12f347b3f SHA-256: c547f66dacdd2160589dd421dbc8cb946dd767ff9810a39fbc29575f75542190
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=pin+bruteforce+apk+download PDF link annotation
    • https://eminenceconstruction.ca/viking1/uploads/files/45490438761.pdfIn PDF document text
    • http://aquatherm-graz.at/files/jofagabawogitibon.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/vusepevefoxusijuzigaf.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147d4e081805---gusaratumotupavariveweg.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/felobajidetuz.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210913/files/20210913015223.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/15310859353.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jotabanezagogami.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/darugevo.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/3377754498.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/29487985506.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336cfd1a5f4---29293360417.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202196347503663.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/genidimexarafalitovaporan.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210916233033.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/denedekitaju.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec3eb8aa46---91811458994.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/fovibifijatesij.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/runofugewewaliv.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/jakupasoxobabibat.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/fasagelokuxadopikafoxemup.pdfIn PDF document text
    • http://homeopathyhk.com/files/1206761887.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/zezizi.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/67201199288.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/dukapemezuteloturejab.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/vitun.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_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 19168 bytes
SHA-256: ab30e625c5ae9ca551a7f34657b2384ea3c92bb7a913d3f7f1a8e12caf2f93e3
font_01_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 10864 bytes
SHA-256: bb992113ff9ff70e06697aee145759f1de1a493d572ac742365f65be41083ae4
font_02_sfnt_off0001347b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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