Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb0c44c69a894f8…

MALICIOUS

PDF

102.1 KB Created: 2021-07-23 14:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8d3dedf45a34b33af7e06b28c345325 SHA-1: 9f91f4264cdf157eb565460073d3e1b0922d204f SHA-256: acb0c44c69a894f80bf1ed0994c821fd8032b67dbd9e48b81daecd8b52c68ec0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised CMS upload directories. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://veraschwemmle.de/fckdata/file/76850786213.pdf In PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/efb5107da66847fbd640a3907436d565/xepukifofusig.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3a01cb6373fb6ec641d089d4f4d706cb/2101311753.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/razuvoze.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/sukukajuziv.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/dufixeb.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/71371800881.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8f89a2d4a---devalapegasebimiwekek.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/zuritexetidanebok.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0e20654b024ecfafe91753013b7a111d/nalexu.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e11589d8---vusexusemakimejuwudeka.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/kisivifowokularavinate.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794cdcd15cc---tolujupovubatumisumezine.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c059fe4aec---11602490334.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/74946176473.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/duzanikarufafiwafe.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cf5e74971---rerovowavexidalux.pdfIn PDF document text
    • https://petek.biz/resimler/files/xivovoduxejoxiban.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e014f7c36f---13535503909.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5621c4cbd---18348511639.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d91ae2252cf28c0d65fa6f81e5b4d0d2/21018907905.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607603bca8ca8---87262596147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=physique+chimie+1%C3%A8re+s+exercices+corrig%C3%A9s+pdfPDF 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_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 11484 bytes
SHA-256: 89b1c227b8c3a465632b2f1edbba2f3056d30edb4a13950f3435971f6dd9f3c1
font_01_sfnt_off00013a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A49 21116 bytes
SHA-256: 3e05f07fd2f48993763d9819c87b448d4082188df321cef637394112ad1223d2
font_02_sfnt_off00016f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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