Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7435e8aa4051e39…

MALICIOUS

PDF

86.8 KB Created: 2021-06-19 15:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0dbfc768ee97b5c2d40f7937bbf73ee3 SHA-1: 91763f6ec915125daed854c2400047be44692227 SHA-256: e7435e8aa4051e3905c3553ebc734794156d4c1697c7bbacfadfad6a7b33d438
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body and embedded URLs suggest a lure related to downloading 'Attack on Titan complete season 2', which is a common tactic for phishing or malware distribution. Several URLs point to compromised CMS upload storage, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://aylincinarli.com/fckfiles/file/deroxekikibadunido.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/j55q0gpdbtac2kbcjl0i1ca4ep/kenanane.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d699d1e52d746959da5a1e221dae34f/91823583339.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00fa34839d---juvuwiwelu.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623106461.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7eca2e7bd2e5491cdd008081a09913ae/wasaj.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/gafexasuwolivapesir.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/30a165ff8e521849bc5a421100ecd44d/63404555511.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/48b55d13fee07a77e4cc08a538f7dafe/famorubawabivijotumiju.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ba9db513---resofosutofetozupejalal.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ib3to1utr5sq53p87umprmstcn/dikomosazofow.pdfIn PDF document text
    • http://jngf.cn/files/file/8070146883.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ekgaipgtuu0pjjvs6ni62hd5e2/23569269492.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zanisobejekofikurabupe.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/sowogiwi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0299b2fa3---86994980441.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/gsosfcu4spdanr8vslcm2r4832/lemariganakuva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=attack+on+titan+complete+season+2+downloadPDF link annotation
    • 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://scripts.sil.org/OFLIn 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_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 5400 bytes
SHA-256: 11edb9194db6dd80b085041353d9529215e3fa3387a65e812ca74b744bae0e94
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 11928 bytes
SHA-256: 75329ecc60400bc3ca3589ac56d743bf74c63a9eb04d515b489307151d6f8a83
font_03_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 19064 bytes
SHA-256: e2fbe0e5a9aab2185b1f7f59704ab4a72a6475a2e3c71c4b21bba7a35e71ccee

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