Malicious PDF — malware analysis report

Static analysis result for SHA-256 1561ca501afa1551…

MALICIOUS

PDF

82.1 KB Created: 2021-08-21 00:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: de43d504874af406e1645ad696f9677f SHA-1: 7840f3fc7c609a00f732b651387283acec8b0190 SHA-256: 1561ca501afa15513d63498f9d86e5bba3ad5945c3d1efa8f6ab4e31cb162c68
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/0dulp6jv87idtk4so7kc28u2e4/36585015718.pdf In PDF document text
    • http://www.bluewhaleline.com/image/upload/File/98497306344.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/46499558588.pdfIn PDF document text
    • http://rjt1.org/upload/files/92492631226.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/90510699771.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/dogawin.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/bfjcp29opum6gtbsk7ajamogj4/lakelujupori.pdfIn PDF document text
    • http://dyweisheng.com/uploadfile/file/2021072022492773499.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/voxizemikak.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/gaxusu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c31526cfde---28759987515.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0101457ee2---wakosinurejuka.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/012ff2bd0570b8c63bc63c021e8b91e4/26012080644.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f632b605e04453d2454fdac4856c9796/gofomin.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ecgnonb8avdm3nrqqrkqjem0db/tesozamomunebaluk.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/38689302744.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14c8df9b5---rujupeganowipopolanivopu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/21905385112.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/fujejetarav.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210709081216588239.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/19425584887.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf4b8bc73---zolasepisirav.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/04898d54db24576a6140ba82c3f563d8/limapali.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210821053645.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/3356760512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+unlock+my+2004+honda+accord+radioPDF 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_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 10940 bytes
SHA-256: 3ee047e80263ad2dcd5022aa87813610c1ea4632f2e1b0842479fde5fdb2abd9
font_01_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 16412 bytes
SHA-256: 8f6060c279594e164f740db85034a550f22c2f3ec43b3d45e5cea511f7f3c183
font_02_sfnt_off000122a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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