Malicious PDF — malware analysis report

Static analysis result for SHA-256 4064a990d73524c5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 12:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d211a58da11d177ce241b805ba5f4b81 SHA-1: f227d7666223302445384628372c04d1b535d83c SHA-256: 4064a990d73524c58e15412142ac6d4c7fc79509b3c4a1f82d3082a0ed27c79a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function of this document is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=logistics+industry+profile+pdf PDF link annotation
    • http://cancercareresearch.com/userfiles/file/rexebikimemipipe.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/jubazelu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d89ede14c---62661320977.pdfIn PDF document text
    • http://someteme.com/archivos/_20210728064136.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/46081446356.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/gupukibinuwubeti.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bff4dc636a---99924382153.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/polidepogilizugakadejaw.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/97955570235.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/vixagawiwujuvevo.pdfIn PDF document text
    • http://guowangcable.com/d/files/92995702254.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8b049c773b525812fe4d0057f32b1d9d/85442934890.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/toreg.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/70704106247.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/wipevafowodowifasosusoge.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b830fec80a821a4fb20f7c7628ef8651/pofuwib.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/93984862631.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/pafafuruzigima.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160aab7a0d7bb8---tuvudiwof.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4a031141ef9c268abb14fcb14a360abf/55875534299.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/jirejozo.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/wofodowirazuwiforega.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_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 10804 bytes
SHA-256: 0ce675e93c754f402b8d24cf0bafd56ff0f577195a2b8a7509fa42bcd4919786
font_02_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 17716 bytes
SHA-256: f01376209d5636fe6400172f8e0aa892c570fa40724179b0d7c742a5893cb70e

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