Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74a728010726e58…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 22:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6aaa5acdcb44266be18bce276c47b4c SHA-1: dc08ac6ed2e220aeb5f970eda02a18ed138c46c0 SHA-256: d74a728010726e586c94162f70938557da1e0a6dfaa451df294c63a89ee2850d
176 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and likely contains further lures or exploit code, but the primary observed attack pattern is the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ekorob.pl/userfiles/file/nimanasunipevefed.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1896013da2---3821934875.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5ed5ef2fd97f3d49a281f54ce8fd302c/kufikevefa.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210717165111.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/sivukemovulijiripubajotu.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/kekumadamiwevigowoxuze.pdfIn PDF document text
    • http://labonscafe.com/userfiles/poverab.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e79d138cd63659c95d742ccc9eeb24fa/jigowoligeferexoru.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/53595550687.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/fijapi.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/pididosepax.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/28849435059.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/wipezotodiregefofimoranez.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/69157110163.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e4eea790---gorujixiwoguxifele.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/76901440648.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/2fhes7fmie75omvjv6fkp98i42/vemivopelolozu.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/39044742420.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/c4sadh70sfv7udnttglb853p53/25092703453.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f17b39601ded4f2413d6e1a41976e894/nulijokuwiredevumukedit.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b417815272---gokurorebakesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=test+de+comprehension+ecrite+en+francais+pdfPDF 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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 19400 bytes
SHA-256: aff9ad72b95cab70f2b433114a3c92588f6a79325bc819d4122ddd8927a0ab21
font_01_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 10800 bytes
SHA-256: f9b42dc149c4cbeaddeb1bcde68376dc57c410fc54f5d00293537db6c0f826e9
font_02_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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