Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccc2f345e23d2c3…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 10:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 824d7711865c5d14eaa194f408980402 SHA-1: e59351f95670c53a491ba064fef105f52afeffd8 SHA-256: 3ccc2f345e23d2c309340573b6c5c15c8a60c9155a0dd7e104d96a6f39834f97
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or malware downloads. The presence of multiple compromised CMS upload links and disposable hosting further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca9e9ceab---sugidikajeredaleluwikesiw.pdf In PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/65813878387.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef5f03e0fc---tevejaluvob.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/51298211404.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/rukarunebavov.pdfIn PDF document text
    • https://scalper.ir/data/files/file/muxidipagegarud.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/33127638984.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a8c2cb61---kijelemovinizeveroje.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/33504448217.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/49771923155.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/jemupetula.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/fopofabafil.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631532148.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/is0amtfgf8h4tscc4qagc6krhhusqp77/fonizosisolal.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/73518787835.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/disikix.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337f864ac2c---texoxe.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/68430256694.pdfIn PDF document text
    • http://uhorder.com/upload/files/88376038849.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613540fda0d28---86538424109.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/77801685737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=merge+mansion+apk+downloadPDF 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_off0000bf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 17304 bytes
SHA-256: cd7d674b5040c2d7d5f4b8140458db7209f04156866f7f316655648ef309f0eb
font_02_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 10808 bytes
SHA-256: d3914b6e3c82c0a69ba1268ec39c08e5e27866c8abba73fe1baa9a02cf2afa58