Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfc7b6d30c91b84…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 01:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b142ff279265f7a6237a9b2104b25056 SHA-1: 0162e9f5ad050667480992b7733e177573201fce SHA-256: acfc7b6d30c91b84684e243d589f1ff4ac300f83d4fd3f27c8fd7b7f757180c5
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload or redirect to a phishing site. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=transfer+contacts+from+outlook+to+android
    • https://dycmc.com/DATA/upload/files/202109181524272307.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/womipanufatili.pdf
    • http://benevolo.it/userfiles/files/22182948632.pdf
    • https://epgeptech.hu/ckfinder/userfiles/files/60704569061.pdf
    • http://studioguatta.it/userfiles/files/tosomemasubopizumezav.pdf
    • http://viettruss.com/upload/file/viwixotometebukaxit.pdf
    • https://total-sport.pl/img/upload/files/bavafobedafakefumojujuru.pdf
    • https://luxesystem.site/js/ckfinder/userfiles/files/litogagopiridel.pdf
    • http://z-sinpro.com/upload/files/jidafejigafawelizaporar.pdf
    • http://npk-bypassdrr2.com/file_media/file_image/file/kinapapawonogikekufiv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ce3c02751---duzenomufef.pdf
    • http://hitechdentalhouston.com/uploads/files/vipudewinave.pdf
    • https://lasanisports.com/files/mimipixugugiza.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fe657eb6bf7cda423099317884f18173/10803304869.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0f727939---satepefixol.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16138397d095f8---81247837312.pdf
    • http://gzhangqin.com/uploadfile/files/28415671193.pdf
    • http://madang.eu/f_pds/fck/file/wobemesadakufufafurof.pdf
    • https://thietbigas.net/media/files/87006724804.pdf
    • https://mgs-on-track.com/uploads/misc/files/majomab.pdf
    • http://eggtesting.com/admin/uploads/file/tuxozikimu.pdf
    • http://tinavaron.com/ckfinder/userfiles/files/93926998147.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db69.bin
888520959e8f01dbd54d09b7b89124b971a177b9e3799bf14e7067ff15a54984
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 17408 bytes
font_01_sfnt_off0001090f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 16792 bytes
font_02_sfnt_off00012126.bin
de933e08ce774a08eec758b9d8faefc2c32dba4f46bedf7e2464de7816ef213a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 10792 bytes