Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46c89abe63193df…

MALICIOUS

PDF

72.7 KB Created: 2021-09-04 07:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ac0e2836dc45a8c3646c0e46b2ba519 SHA-1: c5c7682e86be049a22f142cd1ad52e1ae00c8b0e SHA-256: a46c89abe63193dfe598337334ddfd7713f27aec0f16a532ffc7d02073abe079
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or credential harvesting operation. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these are common tactics for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=tchibo+cafissimo+manual PDF link annotation
    • http://studiodrago.eu/userfiles/files/xipisonuzuzeda.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/48285594077.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/2649240038.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/nisinukuzo.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/89513794764.pdfIn PDF document text
    • http://sushibelovo.ru/files/wogezopuxejexofabelokilo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfb5b8fd37---67010209952.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210808_134330.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/kqb1c8s3f3311vgum1ormfogr8/banozerojolepesuxudaraz.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ff54c14288ac832e4290e68ab420f9ca/23561388003.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/dozugafasimipedosozobe.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2c429af5---94019850937.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c90c6eb6161---xewox.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612382660954b---tesisim.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/13275396619.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7a92d6aaaedc2f3e8469fba5238907be/wugoxesutalopurukafe.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/lewerowomufipibatilabu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97ae89aa1---rivavivamesezibajaxumo.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/koxekisofodez.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/73995593755.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/fomuxanizilikaba.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/79002889205.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/54e3df2106534e96c000e6eab517a6c5/77608513622.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/mowoduxoxozilapefun.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3fb4e4610f97c086168321914aed5995/nupejinuvadaw.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_off0000b9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 10472 bytes
SHA-256: ade3cf5901f38ce9d4f166104924bd1770c080f6c34732ca1f024025477cf677
font_02_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 16760 bytes
SHA-256: fc32703fb82ddc3ae1b6c91caee39892186f8a6a711cbfa7c396ef82ce7ef965

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