Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c4f8007bfecefe…

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 22:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf1b063356c8245367ff4793797401ce SHA-1: 3eed82a5cc5573825aad466f85be8ee78e44adcc SHA-256: b5c4f8007bfecefeeb5c0ae626c082c16c4bce85d985d5fab5d94ca323a69f84
176 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites or use disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings suggests the primary function is to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://akproauto.com/nbloom/fckuploads/file/24039022570.pdf In PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/zilikidow.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/zinitav.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613c220d8f85a---99922800829.pdfPDF link annotation
    • https://gizaviation.com/uploads/files/bovaw.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/65364553014.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/70015614787.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ba7ee82---kowudaxixotiwal.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/19272250210.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/bodapurijogasuk.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/dafekaje.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4b4b3893---zozeviz.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e235b2adb4---wunadoren.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/xigeseturilofemupuxar.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f02c7c85bb---rapexepevefe.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/zekinivakunax.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/67159510758.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210909_131914.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/60263135500.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/pamitasixefiw.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/37890264135.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210903155644135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=access+sqlite+database+android+studioPDF 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_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 18200 bytes
SHA-256: a01851054f43e5616a266352b4f2f417cf975c24431e5428e4acd82c76bd06bd
font_01_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E29 10728 bytes
SHA-256: 64c72e0bbb5c3f860ac3235157565474603626aef8b33c9c35422b39a1c6b40d

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