Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fbeff7cbc4f32a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-03 03:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 99318b39853efc43200d4eb15f1220d3 SHA-1: cc75b2fbd4dfa1316d50a346fd0e79f7ab167977 SHA-256: 70fbeff7cbc4f32ab249011a5ce2b96a6cbccbc61271110bb857785aef5cb8d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF's primary function is to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://medvor.ru/uplcv?utm_term=histopathology+techniques+tissue+processing+and+staining+pdf PDF link annotation
    • https://altbuket.ru/files/soxexapibidewa.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/sorerutuwabomalujoda.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/31856999048.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/46910945114.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/29890820001.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/jagevuxuvudemus.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ffdc044819f---nimokalanada.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ea1331f89---pixafopeweloxejuvikemele.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/difuk.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tt3q9gqhucvh6296d9ald1st0q/81832413160.pdfIn PDF document text
    • https://bataretak.com/img/files/file/81888267931.pdfIn PDF document text
    • https://davaocarrental.com/images/file/22719301266.pdfIn PDF document text
    • http://thegioioto.store/upload/files/mujuva.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/303ks0n0lb13k4dhbgdnv0ug85/65549580621.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/dobivilazivedo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/44e38356f195f23dd981fb8c30983d33/diteleduxino.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9cn8rbrfan4lm9tinn193bsgkr/dujurajojeto.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/46770931783.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/78472353792.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mlbc75cr74gflq32bqrhe2ar87/tevigopavabakalelaw.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/61961599629.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/38754497700.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-27/20210627194904440875.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8dae2ab1---27132447171.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c62591ba7---lofexedepop.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/36073503043.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/99604085203.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_off0000bacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACC 11248 bytes
SHA-256: 2a29dc33e6c4d68bffcdcb0c21412096f0fa6c23d47500b0b1231dea75324073
font_01_sfnt_off0000d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 15384 bytes
SHA-256: 86f6ea856c46b7a436d4d2c7ea7140f054bb9e684daed3b15cbf533219f37e92

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