Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e50e34bd0ef679d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 00:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ebd81bfa16a5ca1e8412a05513ec936 SHA-1: 892908d263f4ebd3ff400f976dc3526b8f85b3f3 SHA-256: 7e50e34bd0ef679d9f8c52f675dcb8ff3b53f96d97457335d7324a72b7117623
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content or phishing sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings further supports this, indicating a tactic to distribute links across potentially untrustworthy hosting. No scripts were extracted, but the overall structure points to a phishing or redirection attack.

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.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c765a07b---44745639116.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/07eej6dosffjs6u0eh2j9k93o3/kabumofun.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/86033422219.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c756e42eb1e---tedifada.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1hgfe4lklgvt71tp8fi8o7cok/zewekepemuvovawaritikanig.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858369d0737---34012571412.pdfIn PDF document text
    • https://renault-service.com/userfiles/97091077735.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723e542d7ed---mevugezosibabomegofafajep.pdfIn PDF document text
    • http://freetds.net/userfiles/file/36951078848.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/33073890342.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/99735679657.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/45760427589.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775cbb78dfd---32692721936.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db3876ca1cd0378314c3bae467a7444e/92083723928.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3bdf323d2---redera.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/basirogewawavimotud.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kotumiforixagizasojixeno.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e9bfdf03901d7d06957beaf5de09728d/67696106937.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613530cb2b065---butiwibo.pdfIn PDF document text
    • https://akvaguru.hu/user/file/buribu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612701ff5399c---fotaxixalunutikopuduwewub.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6pqv9e7qb16o0a1q44l458cb4/zubemirolilap.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/32211850845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=solving+absolute+value+equations+review+worksheetPDF 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_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 20340 bytes
SHA-256: cc52f3d3aade9c7f7a1dc22522a6db7ff81822246c339f1be473dd43b0f8f57f
font_01_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 11092 bytes
SHA-256: dfc210c5102724051e46cc073caa2bb31ba5f5a03b4df37e39d6afa26b964634
font_02_sfnt_off00012fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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