Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd6720cc8ec2777…

MALICIOUS

PDF

120.5 KB Created: 2021-08-11 15:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d15db8fb34537d9c62bf04edbadddd8e SHA-1: 8f16fa21fb8221314e00f54820d5156c2161db8e SHA-256: 1fd6720cc8ec2777c622dfa2527e7389ea9a5df8d1686b89d879ac2a27bbe736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://krisoc.ru/uplcv?utm_term=galaxy+invaders+alien+shooter+hack+ios PDF link annotation
    • http://danangsculpture.com/uploads/image/files/woxurilabef.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/zixari.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/zukin.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2fe747b7417368fc42a9652469960935/30881689782.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021713169239542.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e67dc4b89bda3bb88cc532cec7758c25/wifexijetowuduxa.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d416d0b02db---89809046245.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/14173790970.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/waxokegupujezutobuluxa.pdfIn PDF document text
    • https://bloc-immo.com/images/kudelulegetolukuliro.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/32749002387.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607052e1a7494---78291203606.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/54315156926.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/f995ceb4de0536b3f5da4d109ef688d5/xebigisibopabaz.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e884f7bae10---xizolirifuni.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/b525nu0kc9le2j3j6n9ki00iqj/kifaguxeki.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/933748a5bdb59e183b1f39c7b187513d/8432116940.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/nogusuwenupijazupapiz.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/69438417111.pdfIn PDF document text
    • http://aplus.to/userfiles/file/25960408750.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8d9ff2250---xokupa.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f744c9a16---72333873232.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/gorokajunabilutup.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/jukiwipon.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/77423404279.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16869 10880 bytes
SHA-256: e92b68413b71542ba9ffd0be1bde13f3846ead7f8904e7cc1a07842f5e3601a8
font_01_sfnt_off00018195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18195 19324 bytes
SHA-256: 4d011c6f7b89c3a8dc246eebf0d24558ee084fe7138a1ee42ec2bcb029de519b
font_02_sfnt_off0001b232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B232 1696 bytes
SHA-256: 6a75b9764b76a2c6f7d152a8c92a24b73a4a005bccce61d7a5a969a6a70935e7
font_03_sfnt_off0001ba4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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