Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8791f618972380d…

MALICIOUS

PDF

86.5 KB Created: 2021-08-03 13:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af9c37f502441fd3cfe5080043785147 SHA-1: 59be64fc4d4f56663a2e2b5fe1d1ab8ccad10305 SHA-256: f8791f618972380d793f777de1bb5d9acee19b2061b9198b4d182dccdcef8a97
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, indicating a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a250ad1fc52---divaxunu.pdf In PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9e6d3e129cbbe6885b631457c7801517/45657532529.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/42235945036.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/likomoxupupixebokopew.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/73604424416.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/10118518667.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/j51ef510td239oogm780r2uok4/volagenidimivus.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/tisurawuvubufazek.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608260b2cbdf3---tofegarezir.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a815bc24ffa62a1316d1c4a68d9c771e/muzijisof.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d01bdcc907b---gofimak.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/paxepigewidimilap.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9b5a32709---dufivezidoj.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/64873673920.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210730_1DA372DEEDE530DC.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nundll5lc7sfbj9p8lckagub6k/11672334683.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9b8d571b65b2b675752c486864778a11/27905210973.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fccd6796520f702b4af7ca5e9e68e234/fivelivegalotezis.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/rusotifegozobuvo.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/85748686841.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/zirukowedikozenozurajogo.pdfIn PDF document text
    • http://93564497.com/userfiles/tekowukusufareluxitusi.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/tevebinujuwifinuzaf.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafca37780---jafaxitiposozaxux.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/wokavidirodovifol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=moto+italika+150z+2019+precioPDF 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_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 10836 bytes
SHA-256: 70fde8648b6dbf4c9b14225df68f86fd7735878d74363df06242672623ee94b4
font_01_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 18492 bytes
SHA-256: 695514de69058b8e02e0eaccee1ab62361260b06a433de342307936e119caaed
font_02_sfnt_off00013142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1