Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b3d36b5a429a67…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 14:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e00b81585d52a3165fc2c24dd43d0a28 SHA-1: ba9ba8f320e52ad8b6335e43dfc1deb2f89f54f2 SHA-256: 76b3d36b5a429a6750a3c8231f368685ee3226432d94ad27a1a47760182a742b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://amidoux-peintures.com/ckfinder/userfiles/files/femur.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6a6d2bbc6---fawemebagex.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v2ng50qv4385pl34t5a187cpqj/99342235075.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17412988675.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/ralup.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/77131387718.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/89ead70ca684aa4acadedd1e2ac8b60e/80785446069.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/zejunarititup.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/lefapafapanizogono.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d6ecd050---gosavoluxevabakivubef.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/wajutekitubuzezezasopo.pdfIn PDF document text
    • http://cycling-software.com/files/file/95734024569.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/mavekikojexifa.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/pizitudopizoje.pdfIn PDF document text
    • http://elitacasa.it/images/file/42145763265.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zuvidusirelirewigetotureg.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/xesaxazelodudomuj.pdfIn PDF document text
    • http://mylodge-naoshima.com/64743917202.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/remozoxunemuzesonegimavo.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/rukajolasupogusogujidi.pdfIn PDF document text
    • http://birdwatching.sk/media/file/94002562382.pdfIn PDF document text
    • http://autodilygood.cz/files/file/bewegonugod.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/kezizigokuxexoxisozerik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=top+10+android+mobile+company+in+worldPDF 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_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 18004 bytes
SHA-256: eb6c59ec6e261128bcae4272d4264023e90bf9a1814bbbcc4fe672776c78e892
font_01_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 10884 bytes
SHA-256: 0cb5365a44b48f39ffb4b0b63889ee7112ad30c348ef02f604031fe00eccdd67
font_02_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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