Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7806ea06fdb986…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 20:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43f052981895308cf00fdddec25149e8 SHA-1: 8f49b278634b471c7e1fd908ce8d79a0a0cd2d3c SHA-256: 0b7806ea06fdb9864a1da85a7fca610bb283b9e2e2dab4e5fb939e0390f0209d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially untrusted hosting locations. These links appear to be disguised as download links for files, likely to trick users into downloading malware. No scripts were extracted from this sample, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae4aa5856---80130345397.pdf In PDF document text
    • http://zjhywt.com/images/upload/File/41852791805.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7n0732p942m43oursoqj9n7db6/18946994150.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/50186807726.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2619ce2b2bb1db026f0ee051168dd7a6/21102316074.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2d9b2c7c148b576de6217f4fd6d25564/jodoposomexamidaseruwex.pdfIn PDF document text
    • http://otczenacts.com/media/files/sekukogodojenoterovojobuf.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161395913213a7---84776050462.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/18779497453.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/36934318457.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/093deb24c6060e8f82169f717fb0dcaa/79305294764.pdfIn PDF document text
    • http://artediapharma.com/upload/files/xedize.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/29116982030.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210916214219.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ac4be479---sojomogonobi.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/wokaworegizuso.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109050136022393.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/tuwudovezakiguxuganegako.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/86133477932.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432c7c10ec3---3330383322.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/88831306994.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091514332273499.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/daxazuxaganefiwodewisuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=deus+ex+the+fall+downloadPDF 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_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 10548 bytes
SHA-256: 76d5eecda034b7de239b52aa5450afdcc1d0768cd921750b4a8192497212761e
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 20724 bytes
SHA-256: e9c8c8fc02f803ed9e86086661e0f25148c8a7671cea70ec7bdc8a76985e5030

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