Malicious PDF — malware analysis report

Static analysis result for SHA-256 251fa62c39a6519f…

MALICIOUS

PDF

90.2 KB Created: 2021-09-02 08:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee5ae8d2d2facea7451dd087952718ee SHA-1: 871ea555915c99e53af645f6b203948262b8d8bc SHA-256: 251fa62c39a6519f8aa64f51105172185f2151dbc07bff1f64f40a5d56626cf8
156 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 functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be redirecting users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://allytemp.ru/uplcv?utm_term=sheldon+ross+introduction+to+probability+models+solutions
    • http://stalmost.pl/userfiles/file/10418188794.pdf
    • http://alemotta.com/resources/original/file/suropulavabituvobukepo.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2b9f8831ae580c5b2c87ff3b0b602bac/zadajewiripureteseri.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f214ff2ff4---kunodabibutupesej.pdf
    • http://voszveszprem.hu/_user/file/nakojagudakunefaviniwe.pdf
    • https://suadienlanhhanoi.net/upload/files/fatoxafatekiluwifel.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44400151b---rizawilebewomebof.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd34ae0784d---52236270913.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c649e1157c7---18632297060.pdf
    • http://www.pattyn360.com/upload/forum/files/lavetoviru.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7bd7cd3557b81caf019ac6f8da30993c/13593718784.pdf
    • http://magicdiscoradio.hu/userfiles/file/81029174861.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4ad604f1e7cd2714c3cb071a07bf2f93/bekutejogifulin.pdf
    • http://2990592.ru/ckfinder/userfiles/files/32866094841.pdf
    • http://learnersdigest.org/userfiles/file/dopatanijuzuxaserelel.pdf
    • http://qtjdb.com/UploadFile/2021/06/18/file/20210618_032451_160.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa97cb1a0a0---7144249389.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/87c8cf59d8d2be9fa9cb284a4a6cbb9a/bitifolesusivojovabogidal.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/uretrll1t9klj8it15bs48gj4n/zosogexizexij.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7d7d689545cf37382729d1b57d69ab01/daguzutolexeni.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/542c89a6cb637d6a68eb49563bb9d373/jitefumoxi.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03820a395a---5683602809.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/635cb944248df4418d8320fdd6e9de8a/pijajekazuzivarewiwowu.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f3.bin
12bc5c99e610961df737a6f593d224e3f7714c0e551c5bb72d141e6fce2eeac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F3 20360 bytes
font_01_sfnt_off0001090b.bin
ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 1820 bytes
font_02_sfnt_off00011195.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 16792 bytes
font_03_sfnt_off000129ac.bin
79fba4f462f9a7277904194558c1442db07d84c6e34b9957b9ac0acdc5b97db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129AC 11208 bytes
font_04_sfnt_off0001437d.bin
e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1437D 16232 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.