Malicious PDF — malware analysis report

Static analysis result for SHA-256 478d57387a56c346…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 22:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0430dfce677a6b590443c9237909132c SHA-1: ba2b1b062c43f67f37095a8278a1497dc93ff9a0 SHA-256: 478d57387a56c346c4e8e1961fdbd00c7f8f4ef57678514941a4a8e7fbf4d9f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=how+to+restore+lost+contacts+on+android
    • https://cpsguffanti.com/uploads/file/bilokiruzaroduxinawas.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5995f2dfa---24156193826.pdf
    • https://at1-turbo-j3t.com/contents/files/vedexovexitijozibutipidaf.pdf
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/22314669321.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132870c092e1---lekisitowatozixuzuzab.pdf
    • http://cityclick.it/userfiles/files/setabetubixazalibami.pdf
    • https://handientu.vn/userfiles/file/wedizasirasugadokena.pdf
    • https://all-stage-meditation.tw/uploads/files/613c09f767690.pdf
    • https://htchninc.com/d/files/mepavopupuwavusatal.pdf
    • http://haenuri.net/ckupload/files/48902343983.pdf
    • http://xn--9w3b270a7kf.kr/data/editor/file/68788706789.pdf
    • http://labonscafe.com/userfiles/3451174011.pdf
    • https://wspaperbag.com/userfiles/file/zixevapomuvesemigadofu.pdf
    • http://kirakuramenandsushi.com/uploads/files/1959720372.pdf
    • http://bet-balance.com/userfiles/file/patilasi.pdf
    • http://thunderstar.cn/userfiles/file/20210910075501592764506.pdf
    • http://e-baze.lv/images/site/file/16520304561.pdf
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/40444871146.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b181880cdc---woriranomitaxufetega.pdf
    • http://thietbikhachsanvinhhung1.com/upload/files/zijenekasuriwajipaliwuk.pdf
    • http://boxethai38.com/upload/file/movorivawutusifisif.pdf
    • http://istihdamhaberleri.com/upload/ckfinder/files/rekufonaxer.pdf
    • http://xetaihyundai.net/upload/files/gowurixu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c1.bin
83335ef48931bc8345cdcc33df2b08977a0f77c1c7be2491506e73ee88902472		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 18524 bytes
font_01_sfnt_off0001077d.bin
fe9419b5cffb74ba85a7641f0766257da213d0e3e4e60c2ff436902a959d797a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 10440 bytes
font_02_sfnt_off00011f55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F55 16792 bytes

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