Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf546faf70fbbc09…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 02:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a464cbfa124faa6a5767a272a2864e09 SHA-1: 246f3a521846f010a6fb4feb9542fd8b44fc489c SHA-256: cf546faf70fbbc092f0c02b0f15acc29c752ba6313493ded9413d25880fe5cd4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to potentially malicious or phishing content. The presence of numerous links on disposable hosting and the use of UTM parameters indicate a tactic to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607be18d1d3c7---36936606792.pdf In PDF document text
    • https://aqualibramontois.be/fckdownload/file/11096766894.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/be73c07408c941171029de3e7e171556/85396946391.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/patazegikimatisari.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/lerenexi.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/bapidojimibosumesagetun.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/magak.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/mufepumari.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/pufivusakexij.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/26867704715.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11df4a77b---88573192289.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/779g2s67let7sp5k5ihhqn1cap/wonisamevuvurix.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bba16ba63---32782222325.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f32c6494---bofukazorinumepekezatiz.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d52215810d---79484284805.pdfIn PDF document text
    • http://kasargod.net/uploads/file/miporesilid.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/12635473040.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/66771380964.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/revegolawuvofo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d56a251b---vukurewajexup.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/wiwememetebefebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fatty+atrophy+of+the+pancreasPDF 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_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 17172 bytes
SHA-256: fbaf7d6503fd6b3ae17d6d5a29864a9699155426943d3d3eef80c24e9c96b5da
font_01_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 10528 bytes
SHA-256: 275feae09e8bcd51867bcc46ac12604624c235a0d75e94f4cf66a4d0c4665ce8

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