Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf20b7ef8350924a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 17:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82ac991ee81c558eac320cf315291a96 SHA-1: d1213c8a800c3ca754ef346a6f63232c7ae57095 SHA-256: bf20b7ef8350924a33ba67bb207162eb00544ae1d0ee24a9dd64891bc4cb8173
216 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains multiple URIs, some pointing to IP addresses and others to compromised CMS upload storage, suggesting a redirection chain. The heuristic 'SE_SECURITY_BYPASS' indicates the document instructs the user to disable security software, a common tactic for malware delivery. While no scripts were explicitly extracted, the presence of multiple external links and the security bypass instruction strongly suggest an attempt to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://igs.compcierge-asia.com/ckfinder/userfiles/files/furoduta.pdf In PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/42993078129.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/19115614141.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/xuvitaduzotanudorosuja.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/83212806878.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/likiwiparudu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1cc50d64---51223488983.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea0f4f599---jilomexudotitezefuvuvoged.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/pusosapixega.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/73403847252.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/85252517531.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/fozekomixizogamusem.pdfPDF link annotation
    • http://yaqeen-eg.com/userfiles/file/30317870742.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/dumededavulanutofupilefi.pdfIn PDF document text
    • https://bak.vn/upload/files/53299305394.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/zisoduwifijuruzafeg.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/74168678442.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/20871665371.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/40493081622.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/siwutulazozifafe.pdfIn PDF document text
    • http://ssp.by/var/upload/30354582625.pdfIn PDF document text
    • http://surtek.biz/image/files/20150318_170155.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/46415405025.pdfIn PDF document text
    • http://gr-chem.com/upload/files/pukajuzumadivi.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6f050b21---26700060844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mobile+data+on+off+apkPDF 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_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 17396 bytes
SHA-256: 242e28da7150088ab9f761cb2374777d32ffe9964cc1985bf0a88034de5b91ac
font_02_sfnt_off000128cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CC 10448 bytes
SHA-256: 6b3e67b17f862bb5ade284db18b6bb63b1e61612bbc95118728dc2fd5b65ff45

Open this report in the interactive analyzer, or submit your own file for analysis.