Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d315413d8de651…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 23:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d688c30ce027fb65f3d0ec100675693 SHA-1: c73896aa783b2d0a64caeb6fe16d0e1c5ae4b1e9 SHA-256: e7d315413d8de6513a283a2c7c93d59b43d56de519008ba0c49b68eda09d17ab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with some links specifically targeting compromised WordPress uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=forensic+image+android+phone PDF link annotation
    • http://aquamedia.cn/ckfinder/userfiles/files/25245093285.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zugejufovagarejironuber.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/wexorefuwawileronutamogaf.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/57399700011.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/xivijapagugogepas.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/98182752189.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7f6d18986---fisotizibijadidakinedev.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/60492453008.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/39094848933.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/4c00b4ff75e7e66f0cd8a75c00f9cb58/tumusuneked.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/kepuzewowuzowisukiladalag.pdfIn PDF document text
    • http://www.bash.cl/media/file/5160677823.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/0ca023c876f92d4b02794fbf998773f3/bawujivekuwuzajobir.pdfIn PDF document text
    • http://svx.su/ffile/file/sodufiwuro.pdfIn PDF document text
    • http://mdtrend.hu/files/file/77355480403.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/miwer.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/93119738062.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109170225342471.pdfIn PDF document text
    • https://eternalbliss.net/file/rejuzorogawub.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/39098777521.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/50405242279.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/jemowapov.pdfIn PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/25101387877.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210903_84FD24702F0E63A9.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/jumixuguwazexefinurofized.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_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 17296 bytes
SHA-256: f08f4d965c74198253f523d47fb9939cdcfefc1748acfb90da4397e7b0dd62f1
font_01_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 10796 bytes
SHA-256: f08d295fb3c78f3205aa5f0ce5f414608ce5f67ce59a15330c9f0a3f2aa47057
font_02_sfnt_off00012791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1