Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeafcbef2a7c7256…

MALICIOUS

PDF

84.1 KB Created: 2021-06-27 16:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6d90593bf6a76d7354b7e9bb0c98e925 SHA-1: f3368e7e9d50da95ce27a9a9313bcf2f4378c504 SHA-256: aeafcbef2a7c7256ca610f0a1bf1be699068447f0a794a8fa5dc052c1290ba47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous URLs, many pointing to compromised CMS upload directories or acting as link farms, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farms strongly indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=signs+that+you+have+gonorrhea PDF link annotation
    • https://ovalpolycoats.com/media/26827327929.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/53753416452.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/172c1d3ce4b3d7e866ea8ed3f1fcddfb/pomil.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607606e632f8f---puxenoxene.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210605/file/16228257177103.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/josoluxevukunov.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///49991228405.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/tinakhue4p1b24pvgp705t3dn1/19919813606.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608451d1f0696---86135363051.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/39516507381.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/msvqmur6ql0upqvllu5lmclvi0/93939463024.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7f0ce0d74be97ebddc3b0d93fd7eb2ee/jinaxuropudiku.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3bc4096c---38493608250.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/padebefowi.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/lebusufabonijevulinumuvob.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/toxesajopisusutog.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d446e4e49f---rukiban.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c3l3cv2nqmdipi011ppk9mktn5/zijalu.pdfIn PDF document text
    • http://wenxuezj.com/images/File/36746530748.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/46399256966.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/adf85f6d40f6bc06fe9dd4fad51b64cf/jajemefe.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/94871247685.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160985853a12d1---zatomuvexajaxil.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f6643929d---70003614344.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_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 10696 bytes
SHA-256: 4046d81c90e31151a06431a34c41338b7b0d194b708fcf2c2e1605dc0520612b
font_01_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 16580 bytes
SHA-256: 49a3dd269adf6fa263adde7c811faf0443302452c4be4d703ec0676a7cec6e5f