Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd8f2d62fa67aff…

MALICIOUS

PDF

84.5 KB Created: 2021-07-16 09:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51a75afb0754fd15dff5c804cfa9ff72 SHA-1: 4bccb0d25eda15cd2fd39c200ac7ad3a1c690bc9 SHA-256: 1cd8f2d62fa67aff434485ceef3fe0cf16a71cb0809769f09203279b135e4834
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external resources, likely to distribute further malicious content or phish for credentials. The presence of compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://eghamatyab.com/basefile/bainbookcom/files/38065812989.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99aeb35fed---sewabosuvubowawinuvediza.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6825600aa---babuvivog.pdf
    • http://tootingtaxi.com/survey/userfiles/files/28999805927.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/cb6983ef2d4060bcdb579662a6daec93/33573165783.pdf
    • http://boekenwinkelindex.nl/images/uploads/45263727757.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd60be3eee---84182316918.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2623e1426---zijitomodifox.pdf
    • http://classicalgardenornaments.com/uplds/file/sinuwejopatuli.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160851083f2af0---doduvonaforirevigabokud.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160751d2b88958---83602494799.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/fhotsc7tmuhq4ln7i4fveh1aie/mipigugetutepozanosiso.pdf
    • http://carrozzeriabosini.net/userfiles/files/921408153.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210617_BD8C6B8098D1AA22.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607affd7dfb3c---dawexaji.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/mabaworizuwigixemo.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ck0fp37sjefokei02mrc03rmte/dajedokezuj.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/93251657401.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/309bc05f17741a4a4e7bdb5b6d9d7e44/97739456462.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1hqeoskilq3q3gv2ob0dvcdn06/18537583792.pdf
    • http://aceonlinementors.com/userfiles/file/tuzosabamug.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098aeed622dd---61731446510.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=beyond+expectations+quotes
    • 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_off0000e5c3.bin
1d04a90fe9fe856eef308da894398ea43cd4244a98bbe5455ae162726406d290
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 10876 bytes
font_01_sfnt_off0000fee8.bin
8fc35b1324f110031f49245bd2ce3156974088c400e4ecec47e8e4cfbd129a7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 17100 bytes
font_02_sfnt_off00012b80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B80 16792 bytes