Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a78ebb3e9ad8a17…

MALICIOUS

PDF

82.7 KB Created: 2021-07-16 17:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb62a1c6b54ad3755ad75161decf37ba SHA-1: 6a1924f18f4713eb21bcd874b98cc20ccc1f64fd SHA-256: 0a78ebb3e9ad8a1751add5432747ceaa86de4a73a4d8fa446e4ab227be945abd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to PDF files hosted on various websites, some of which are flagged as potentially compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • 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.
  • 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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/54be6634eaed11af403c0a6a5bc6ed9b/10644104458.pdf
    • https://west-holding.com/userfiles/file/45290785655.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/31659820508.pdf
    • http://biirbeh.mn/images/content/file/sirujavudo.pdf
    • https://diedacorporation.net/freesiafiles/file/sekafaminus.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b633af85923d4b7ced3243160fd3a40/xezojuripizalelotuwibexab.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/60552447132.pdf
    • http://studiotecnicobonoli.com/userfiles/files/27381405509.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d3f3a31bea7be683920d51e44b3da244/jafivekibozidafepowo.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160745f677c8ec---modazefibadatunu.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/mm6odku1mdr1018aa49mdjab9d/bugexekusevijojokifuw.pdf
    • https://workinhotel.com/upload/fckfile/98670827941.pdf
    • http://arqing.es/ckfinder/userfiles/files/28996834549.pdf
    • https://davaocarrental.com/images/file/73079149616.pdf
    • https://tennis94.fr/img/pics/files/80530009200.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160769889d662a---budazumiwovojuworojosep.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/hic15nb6ui4iq1071phl2raan0/bodutetokup.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160aff3aaece61---97475629167.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jt4j912p7aeb48m6hbri5c72s7/vujajagakaga.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6d84c658---62110489841.pdf
    • https://alatheir.com/atheirwsfiles/file/tumezodira.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160735f9e8d301---sasaro.pdf
    • http://tgtech-auto.com/userfiles/file/47910237787.pdf
    • https://foundryindia.org/userfiles/file/99939141210.pdf
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/vigowa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pink+floyd+wish+you+were+here+album+free+mp3+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd85.bin
c467944756fb07e6817a04cc4b57c90de70c11160156e94d51d7e2d48ee16ea2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD85 18624 bytes
font_01_sfnt_off0000dacf.bin
da6142d750967587839f3a4891c2549dc6a2fd567133f94c1878919c8a5cd4ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 11372 bytes
font_02_sfnt_off0000f532.bin
56b9c7473adbe545fdbd03adb0a5dd9c3a0d8028d0c2bb61b6ddb66960d5ac64
pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 17200 bytes
font_03_sfnt_off000121f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 16792 bytes