Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73cc86411f4d3a3…

MALICIOUS

PDF

91.6 KB Created: 2021-06-27 07:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a13cfd6d203829b110d75c87ea8f4810 SHA-1: 99c1eae9ee752dc36bce6c3f4c8a303bcf73f536 SHA-256: c73cc86411f4d3a345afd5d8ddede4dbdd6e3d5060a8885c22e40850b03462f7
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute further malware or lead to phishing sites. The PDF structure and the nature of the URLs strongly suggest it's used as a lure in a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1c1d51ea---94279271663.pdf In PDF document text
    • https://bnbcostaverde.it/userfiles/file/11342923385.pdfIn PDF document text
    • http://contactconfiance.com/files/files/93397450931.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/gagetejewoturowazazegiki.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/fenobivizelevujubuk.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e0d1b74---jokuto.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/56332106594.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/gagirafazalufu.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/79762647794.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608797e841de4---53750154369.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16079d045ed642---32946485994.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608469c25c402---waxawarizefeviru.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/60399847546.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/47abe6413a0647ff31994cc9a80bfdd7/19863595220.pdfIn PDF document text
    • http://indel.sk/userfiles/file/bewojuzomobave.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/xidujuvojonuvimipopixow.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082d633dd53b---xifisovewelejatija.pdfIn PDF document text
    • https://mojer.bg/files/43762271353.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ofmt05udvrqesmm8jaisprmkbu/13868799644.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/694440f60b6a01ba81f9501942932477/99486617053.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/130022b606ce3a8e6a96df03e23c1333/luponekuxe.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/podunilum.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf9bb659c---lomojobifirerefudamatid.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2816042550---62699594166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=spanish+words+with+k+in+themPDF 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_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 17460 bytes
SHA-256: 2a9551290fa761eab55a1559e36044e134110b484caa805961a3d0665512e29c
font_01_sfnt_off00012eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C9 10864 bytes
SHA-256: 5774ff30937fa5b18730ff7229ae0dbf1b134b26bb3848055c602b5b1ec60779

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