Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b160a68bf905b44…

MALICIOUS

PDF

79.1 KB Created: 2021-07-03 05:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c72e6be432a5390c44257996bcc87caa SHA-1: 4acbee9466d454dffd8ad6e3f82c21688cbfe293 SHA-256: 0b160a68bf905b44acea8f4108c8827508709bda9fc8cb04bca08a9c792064dc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF links on compromised CMS uploads and disposable hosting further supports this. No scripts were extracted, but the document's structure and URL patterns suggest it's designed to trick users into visiting malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d847d09d00efddab79a616838bdb59c7/wevurumi.pdf In PDF document text
    • http://thedreams.cz/files/wonitipaginonudaxomuj.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105152227456550.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/27547188609.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/jipizaxa.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/sofono.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b17b35ac1---dufezifad.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/mowelubezivibenefo.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/95027867645.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79fcd31ae---dutibetuvetejulijoku.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ir9mllbr361m2afkgh3oslgopt/puvijenokaligubevetapab.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6f10052cacda5961c70681cf7792e74f/30970087338.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608069f9c8755---kawawexovulilu.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/puliwabibo.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/42318782000.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d11846ca9e---74448300407.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/tamuragojokevukowosokis.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e6478335---54488505619.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088c49b5f7fb---73706026224.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/e2d3c29aace985dd1b4c330e396377d5/59732071421.pdfIn PDF document text
    • http://zae.me/datafiles/file/10172418936.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d24ba6c9c99---mefaju.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/15168544956.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02695e53c---tanefapudozakesetoretirer.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/9446101044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=getting+your+drone+licensePDF 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_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 10636 bytes
SHA-256: c772425dff8599c172e41d105e4e7d746437c1da5e4eb6018b166a382ca457c2
font_01_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 17456 bytes
SHA-256: 0ca2526fdcd0c7d7ceec8b5509ecf17906409e25abb5989e9541cbec84c84793