Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb90b5775760c38c…

MALICIOUS

PDF

85.4 KB Created: 2021-08-16 15:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b7d62326d13dbbfd0d0ce863f856d94 SHA-1: 41f9fc93e03ebde351f3d3c666c7ce66c114b33e SHA-256: eb90b5775760c38c9cb1254c923488069d7e0356035127acc16d251947a4eac2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://diedacorporation.net/freesiafiles/file/dafodelipuzagif.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a35832c3a1ae52286b60c6846ab3e06e/meguvamuxuxuduvuturumi.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/71014579784.pdf
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/pigajox.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/20077aa81227c3f8b85f1924b7d55948/66676890222.pdf
    • https://forthepeoplegov.com/userfiles/file/13663061321.pdf
    • http://aexpress.lv/index/images/up/file/55587935105.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16078615dc1849---jepevirizawibutilideximid.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160895e808b107---24609561979.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/rh4t2b2q9eepma62omoo69rvim/piveregijewizogusizot.pdf
    • https://aviatroglo.fr/IMG/file/28118752737.pdf
    • https://ikuseikyokai.jp/ckmedia//files/tijutamojiwogakesuxi.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/bc20b845ed1b271170319489207f4f27/xusozemideweg.pdf
    • http://blackhorsesc.pl/userfiles/file/najumaxunatebekefojawimer.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/84163044259.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba45d87c211---tovopum.pdf
    • http://nuocmambason.com/upload/fckimagesfile/b74fc1053034edab9411f61360e4400b.pdf
    • https://biovuspharma.net/userfiles/files/rowonapodebepomo.pdf
    • https://raiporjai.com/piceditor/file/pojeso.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/90on2q1f20pq2bk61gam45h0rb/fepaguboragemi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=neo+bomberman+for+android+free+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4f.bin
77b13bff04f14fe0bbf1c5acccc9fe071a8bd0f07e373ec78659846f41c65e9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10452 bytes
font_01_sfnt_off000104fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 16792 bytes
font_02_sfnt_off00011d0c.bin
3b546392b1556e490ea0889fc189aa01a6eedea42496ee6587689420d8b4ce6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 16636 bytes