Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c26813b3d9b469…

MALICIOUS

PDF

75.0 KB Created: 2021-08-28 03:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 993b90c78582769422207b2f62776120 SHA-1: aecf28a7b601cd1a7ff7cbcd44250f2222188e97 SHA-256: 35c26813b3d9b469983b52f1268deacb515048586ad1d783c5331305862d133e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The PDF structure and embedded links indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ibshospitals.com/userfiles/file/35951986463.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a18c626c8e2---fivibapuluzegafenanuwuxa.pdf
    • http://decamiones.com/userfiles/file/40931735269.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e93b28fea7---55738649054.pdf
    • http://usaoxin.com/userfiles/2021-6/file/67501149265.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c683e14ad8---vowus.pdf
    • https://emmaushuis.org/pages/70404668657.pdf
    • http://campfirewtx.org/userfiles/file/53314629752.pdf
    • http://location-appartement-venise.com/italie_documents/files/ripif.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bcd69318d---nakisoluvipuvogixo.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb97a4e7d---33070209218.pdf
    • http://af.ssla.ru/images/fornews/files/37409079786.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/eae8a355762c1806f98adedbfebc460e/89638078902.pdf
    • https://hanomanberjaya.com/contents/files/guzufadofaberazadizomizof.pdf
    • http://irs-messtechnik.at/upload/96261846448.pdf
    • http://silver1979.com/upload/file/sagepafakudibegutug.pdf
    • http://www.tractortools.cz/ckfinder/userfiles/files/81008649632.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b86227b54---bivokapumor.pdf
    • http://sieuthibds.net/images/files/843172196.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/nho4hj3pfgg5rh8i9u4euh1q70/86327043782.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c27cc89899a4e55751a47802d4e96f4f/82976001079.pdf
    • http://sity-luxe.ru/userfiles/file/josudumuxidufosuregolij.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/50lso8k19l9lh1h2qphir097gc/rofovigorokapopivenopoz.pdf
    • http://anthonyvienna.com/sites/default/files/file/17399146622.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb9b6fe3e---vamogi.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1ff5cf4e4ec8eedaa00acbe734e37076/volibasufelizadujelolaso.pdf
    • http://homeopathyhongkong.org/files/xumuxebedum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=forsyth+county+inmate+search
    • 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_off0000c3cd.bin
fa17184bf73250f244d3603df9cfa860cb4d10700adf4d38e765ec48a88bb058
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CD 10640 bytes
font_01_sfnt_off0000dc0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 16792 bytes
font_02_sfnt_off0000f41c.bin
24528ee4cd3eeda6fd8eeaf3adba539735a307c52f43206d63c163406c8efcf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 16524 bytes