Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad15b069a4172e3…

MALICIOUS

PDF

84.8 KB Created: 2021-07-31 02:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 583d28c37bbffe6b277b040bc611d88f SHA-1: e3afac7fa99ed1d0af9c18c1eb1fbfbdc6179dd3 SHA-256: 9ad15b069a4172e3d7fc84cc4fbd19025da96c68124ccb4e6aa8cc1c0f4703c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://huntic.ru/uplcv?utm_term=exercicis+perifrasis+verbals+2+eso+pdf PDF link annotation
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f614fd82489---xukazopulazawogogel.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/26935049990.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ac6b41e8---25158752951.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/u38saph63ljqblsf1hpr77fbal/pokazumigotokikosit.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d524e004b6f---pikonalixomogakipimu.pdfIn PDF document text
    • https://angkagenap.com/contents//files/lebasorulasi.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/15581789493.pdfIn PDF document text
    • http://skomi.ru/img/files/file/sebigirikub.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e53d3c9b38c0c2b774d6d6dea158298f/34730973992.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3709ed33d0b78238f4fe39e0aa88443c/9413693387.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/11516006400.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/tipiveremimorowomez.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/31548397270.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/o8pf9hot9i9e9rbkrrql7k8ooq/tipifasebij.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/rixazonopizegazapid.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/gawetelivemunoditotoweg.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/74282751177.pdfIn PDF document text
    • http://scoopsites.net/userfiles/file/sanom.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/29764755147.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075e21251c9d---16548596445.pdfIn PDF document text
    • http://placc.info/up_image/tafurazitid.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/zilusufil.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wojavivefawudegis.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160721aa794a30---23799390171.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/xubivojugit.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/figupegaxarijaleli.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_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 18956 bytes
SHA-256: f0fcd41107bdf8dcc7c5e03c5f52dab844e48608429f4879f0f741794cbc58a9
font_01_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 10824 bytes
SHA-256: 61ba619645b08dc9873f1fd7c8b172eabab316bcdcb957ac2a4efebcf31627ca
font_02_sfnt_off00012b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1