Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd16546d1f4aff36…

MALICIOUS

PDF

79.8 KB Created: 2021-06-29 15:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1f90c23058a3cd0815d5fb036634b1a7 SHA-1: 27fdf98a735001cf0d7ca8ba32dcba79b83ee58a SHA-256: cd16546d1f4aff3600efa03f31953218a641cddf677330303a779f1da9caaa8a
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a lure for financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609632f576fe7---lixolew.pdf In PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/rn5u7d61l8ea96ivhu226fh17g/gexupa.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/fonogebapezesifaxaladuz.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/an46pq4l5k855gcdj7vqd04sjp/2310523032.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/xixesineli.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9duf39sbei6l6felrjbm7eskm6/vudejolopesasabufunaraxud.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b0d3f24a---gesemoledexat.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1b0a6ad1---37751821733.pdfIn PDF document text
    • http://chromatographvials.com/d/files/dovogadutuledanovotes.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/65843369812.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8761813875.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/51ecb524755b7963fb4168023a3ecd44/wimidixatofilegetitupip.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7d4b21f7a---75533286528.pdfIn PDF document text
    • http://haai.org/upload/file/jevirexofuwalomivunobogo.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/77226633588.pdfIn PDF document text
    • http://babamoleskine.com/files/file/bajexozorupebijuperat.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5179f77835---levurotitikuruvixiru.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd95a55153---fowisig.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/34595656375.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e32452ab0cf2e0a891e559280c207dd4/larezuzajogazedudedepubef.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607921f10eba4---78307596899.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d6ee2b7fd9c6fa05a27329af6dc4b50e/mufatazumuwobixa.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc97e46950---55998158831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+many+players+on+a+soccer+gamePDF 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_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 16700 bytes
SHA-256: 93cda00e10187f49fa1ac089faa462cf5d8ff5e51c374e1942bbe11b9fd1fcf5
font_02_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 10720 bytes
SHA-256: de31d8cee5cc0113498cb420efae065e885f8c0ffa9347ee8cb3cb6bbbdcfcbc

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