Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5259730a4f7397…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 07:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 786e7bcd61588dd44d52ed2a741fc957 SHA-1: d1fa50a429e7591187f15b63eb179e3d7354e78a SHA-256: 7d5259730a4f7397ff71ec40aa6a14ebddd67aebc918bbb312f52e2aab62cc43
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a tactic to distribute further malicious content or phish users. The presence of a link farm on disposable hosting further supports a malicious intent to obscure the true destination or spread malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jdlpartnerss.com/userfiles/file/nudupujabalibidudupejexe.pdf In PDF document text
    • https://fokusmedia.com/images/uploads/27346758932.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/net09v6vv9iolgq8ma2lftmu5p/deneteponowetubaxo.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/72001961885.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f35b2ef8a208995478448908819e683e/39736413296.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/78022061406.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/597141157.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c138e28981d---maruwadenipoparufemaxiliw.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec39fb0bd7---60046622474.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070abfc982e8---97960907733.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/28247404469.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92200939251.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/28902445496.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/3119822583.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202108260132569334.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/jj8bink94kt6sef8gqchbhir3t/27827849580.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/mejalote.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975edc2dcce---41433321116.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c502d38ec35c0bb7456ca47bb885aed2/vakalapevugapigosutelop.pdfIn PDF document text
    • https://anfauglir.com/images/file/somuxibomepiro.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/71596570127.pdfIn PDF document text
    • http://fkhd.cz/data/img/xetesebelibebukif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=good+research+topic+questionsPDF 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_off0000c724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC724 16924 bytes
SHA-256: 7e1f7a69075674a48479cd553def5eb35a32c7484b9b4661bf7f5f3330289df4
font_01_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 10848 bytes
SHA-256: 50411f9011a25c4252f36a6887e14e7ec67353649127d2bf171a02f29fc9a7ab
font_02_sfnt_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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