Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d33c7ca85e400a9…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 16:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 186590b9cec944c0a14dcb667a8b59b2 SHA-1: 5fe544b3cce4fde312f15f3c19656756a06613ec SHA-256: 5d33c7ca85e400a995de484dc0642fcb1d8ed3007335aa396b8e35322ef9e09f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=electrical+engineering+technical+report+pdf PDF link annotation
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/6ae7edb41042faaac09b4ab632949e95/59528305990.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/marogididise.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/xedox.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/3486745206.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/206886062.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160759663b4e05---puzijodinak.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/tolg058jchgu6ikth2vnuhipgr/52972921644.pdfIn PDF document text
    • http://katachizu.com/img/news/files/19529004086.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/feganobowuvapapakeguzoz.pdfIn PDF document text
    • https://songhong.info/userfiles/file/49895362599.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/folikinutesipukilaritawe.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/36e46eac3aba763aeb5dc92067722120/73835864618.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/52969750364.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210627102257_ha8a1m.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160949b9ad2078---3019693866.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4adc79fbb---xotewag.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/rewugikoponabila.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/luxanunurugiviwobenujoni.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607048985930c---78031857764.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/k7st9ai7ppp47me0h6qk9irs47/lezixoge.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/22664262940.pdfIn PDF document text
    • 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_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 17008 bytes
SHA-256: 874a29c4c2eaa216103b1d349c0351b4a8d9848ffdf0df8356b9b1a8f03b8518
font_02_sfnt_off00011601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 10712 bytes
SHA-256: 657c9bd59ddae76644c0493d8e86b3ebb416aec35db97fd4d286a79f3552015a

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