Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93bc367ff430272…

MALICIOUS

PDF

85.3 KB Created: 2021-06-25 12:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 80093017a61de082b56042db1f29a8dc SHA-1: 51197d2c890e025dba02cf1e9ecdc01ab175310b SHA-256: a93bc367ff430272deade956c399b169057f5e2a5d708208f4bc51fb212510e7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is used to redirect users to malicious sites. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=the+landmark+arrian+the+campaigns+of+alexander+pdf PDF link annotation
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/92fd0b382f1efa2cbf6993abefd06be0/96526620547.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/8727918328.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2cdfc4764---dagabuzolezewez.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088a38b52623---xamirejabufojawixemoxa.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075807c48a90---5911137003.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/36748024977.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9ce80e8dd---xugezunadepiwepol.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce7c28b28a---8727063813.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba51fd1802e---92703915009.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/82785710660c344b738286.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160745e300b9aa---27767975036.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021043012555873499.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/wotofexabujomavaxid.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d6f806741f1ea3bbf22d9aae0e44def5/lavibajujuxiz.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160763d887d070---65987470806.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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 19432 bytes
SHA-256: ed47abffb1ef156b175f6ca93a1f68658219ec4b34b99cd3994c8d23b31070ec
font_01_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 11224 bytes
SHA-256: dbc0eb2c8c78bcd5b09c379fdc4df95c3b6cb6b78183d683c74373d5816003d4
font_02_sfnt_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1