Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0458f4baa5df6e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 15:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80e4155ba05d063a132e37944cfacc98 SHA-1: 17d0fdcd58a06cf9081922dc37b1dccc23159a22 SHA-256: 9b0458f4baa5df6edc202bfd3601a87689ba32ad52935fbb774a3a9dd04df9af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/7371f77ekorng9spgg0toel9fl/zegoniwafup.pdf
    • https://primer-spb.ru/files/files/74718298933.pdf
    • http://bwemfjhjk.friend-match.com/upload/files/zaniwovebukujevux.pdf
    • http://s2ipower.com/survey/userfiles/files/kopixuzeterera.pdf
    • http://gzcil.com/uploadfile/files/wirefijipuvogupojoxota.pdf
    • http://gabident.pl/local/userfiles/file/zomopuj.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d45314db0---pukatukudewuvetopedusilon.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132e67f5cf06---38710135068.pdf
    • http://quatanggiabao.com/images/uploads/files/6866393453.pdf
    • https://xn--80aesyq.xn--p1ai/files/file/wiropoxuxod.pdf
    • https://xnkvinatimex.com/uploads/files/sisoxapafikivibugo.pdf
    • http://beautifulmoda.com/userfiles/files/87932698128.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/dutezofaxinebo.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/galisimawovetoketejovafu.pdf
    • http://sakuragiramenandsushi.com/uploads/files/7018272189.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a31b9b99b11d8ddbaf2e483d1ee05b65/losume.pdf
    • https://saksisan.com/upload/ckfinder/files/97668196016.pdf
    • http://jj-metals.com/userfiles/file/2021090807112873499.pdf
    • http://www.gesas.it/media/mailinglist/file/xulibamimosobigonefuz.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tqf94uvbffigv5atikvpk688a7/tadokosiv.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237dc448fb---2167352977.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=watch+full+mma+fights+online
    • 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_off0000e1b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 16792 bytes
font_01_sfnt_off0000f9c5.bin
26838ebed969cce4cf9550668a89e6e7ffbfb0cfc4453a2b252e1997f7aed846
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 18200 bytes
font_02_sfnt_off00012985.bin
f8b0b54ec8fab0b899300ab5c36cf62693fded8df7826486114f51ce029a1909
pdf-font-stream PDF embedded font (sfnt) at offset 0x12985 10776 bytes