Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e66d433e1e31378…

MALICIOUS

PDF

89.6 KB Created: 2021-08-03 20:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bf2b9d32dd1181825d8e0c24c1dc22a SHA-1: 1affb8fef11b8e4a1f4e5ecef56bc5abb7cd6ae5 SHA-256: 8e66d433e1e31378fe90dec7bdb98e48040f443fd227f1c07382b870a63f10a9
156 Risk Score

Malware Insights

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

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, pointing to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, such as the one hosted on erkerlaender.de, are likely intended to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e2f0988f30730971302bef31f56c9238/73989458925.pdf
    • http://qtjdb.com/UploadFile/2021/05/26/file/20210526_071033_133.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/34452180639.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608147de25273---tefukanavugemazofa.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/873e748d423cb967fbad8eec624eae11/1556361085.pdf
    • http://proart.by/media/file/15173159770.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0937813247---841369114.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/xumamogikuginuv.pdf
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/34529306953.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/f4daf086620c3e6e452cb12348cf272d/zumakaxuwuxoju.pdf
    • http://cbcom.eu/ressource/site-image/files/luwubekufiguxajiwoviv.pdf
    • http://shop-cartuning.pl/userfiles/file/61329653998.pdf
    • https://kemxoi.vn/app/webroot/files/images/pages/files/83911209800.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/40a30j9tp8i8i5ep6qqgkhj120/19870196819.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45374401247.pdf
    • http://kppzp.pl/userfiles/file/dodisam.pdf
    • https://losungversorger.com/product/file/wesuzojaterisawalifumixe.pdf
    • https://bczenekar.hu/files/file/35487874666.pdf
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/47494037666.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2a355a110b6deb6ba8c8d006a789ecce/diwapusajiluxagi.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070685dc3894---jowamumalirozagidep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mcgraw+hill+connect+exam+cheating+reddit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ad.bin
21660bafe6b54b5f04b0c3a649343343886b79411f0e8a07c847d45ae45a6b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 10832 bytes
font_01_sfnt_off00011157.bin
9463973fcf1e1cc62e97fad8f4f541224140639c34069ef63333c17da494d755
pdf-font-stream PDF embedded font (sfnt) at offset 0x11157 18148 bytes
font_02_sfnt_off000140ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140AC 16792 bytes