Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e85b358a12258c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-05 14:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f14cd11c96d55f7a8fe1de954d1b9c04 SHA-1: 3ec0b34852fa02d41dd9ac67b2a44ac97ab353b4 SHA-256: 65e85b358a12258c55215798bb0acb4c39a1e1b593d3b366bef0b89a78d8ef67
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating attempts to obscure the true destination or leverage SEO tactics for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=barbituricos+historia+pdf PDF link annotation
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/72e58adc5ae9a6dd638f44452a037fa4/58439081569.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4359fa95---88544966097.pdfIn PDF document text
    • http://araonline.hu/uploads/file/55914498259.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/bixowebowijedun.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/seramobexawatuwi.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/41753304084.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/tobinexezufudotoxe.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c24bfb8b21cab30403eb59a0865ea1bb/bunezul.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/57543637694.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090bac8df33d---kategujulodulane.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/wojowivob.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/jemaseselofejenuzejefizun.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/kezedovozosenelopilizeza.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ed113e3f309---xorukuvodefesu.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/lizuvuvisetod.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87b3463c5e---fitujira.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/41230065983.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/keruma.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/lcp87aenrk0f089k4h00rj00tt/povaxa.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/zawabenifusunod.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096de213d927---11338569241.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/30140882962.pdfIn PDF document text
    • http://stattus.com/assets/file/21164866942.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_off0000b54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54C 10728 bytes
SHA-256: 9f1bf926ab2d87a73b5ecfc5bdfbdb2e7c4535de4780ea4614eb217eec7183ab
font_01_sfnt_off0000cde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 16788 bytes
SHA-256: 492273e296700c64f160407235f675f650b7e0b593aa1812ff8c0c77dffcf3e6
font_02_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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