Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6e991b6cc8fef9…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 22:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 18785418e237054aaa3acbeb1d996dd8 SHA-1: ea4c00cc56c9c43f96e39538737c625eb094554b SHA-256: 8e6e991b6cc8fef9577351f2a9b5f37a293ee20093549b3632ed2a17d946a0e8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ptichile.cl/userfiles/file/4765947873.pdf In PDF document text
    • http://cbgnfinance.com/userfiles/file/44547770594.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/4910503837.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/newifelidoboradofu.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/rosekasawasomedu.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/75148036210.pdfIn PDF document text
    • http://teifsepahan.com/files/file/fekemop.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/wavuto.pdfIn PDF document text
    • https://12waktu.com/contents/files/54218907092.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161389559beb7e---bafaworawewotolurun.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/71030413936.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/67737736173.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/bosm9r24dao8k09106psauiern/60189914018.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/83481431704.pdfIn PDF document text
    • https://ijp2.com/contents/files/14875371327.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/komusigasajupatabofubidi.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/veniw.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/772dae26f2518271398cb253e11e6e8c/56689105036.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377b581600a---20886134654.pdfIn PDF document text
    • http://guitarenko.fr/img/files/tatadefu.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109151128367449.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/lavubixixofedu.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/95194688107.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/88171767116.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/64432040201.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/legujezidifarufujozukovep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sword+art+online+alicization+part+2+episode+6PDF 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://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_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 20716 bytes
SHA-256: a8d0390568391e0e4a7862c352d9542e27b34fc2a5bb3ac8c9bee60303dc2dc3
font_02_sfnt_off00012ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECB 11016 bytes
SHA-256: 7fc6aa73fe96ff7b63e6985a4450a5a876634c02ef6d4168064305b1d1535cb3