Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e25b88f85743665…

MALICIOUS

PDF

95.2 KB Created: 2021-09-05 05:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f4dc32816dc7391165e0936c4bfcb6a SHA-1: 8248bee3ab6effc63f73d94e4c408ca13315f168 SHA-256: 1e25b88f857436659052affe6740a430da4d89061fa7beff2382480c894702fa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/mhhehr819ro5ne7crcucec17g4/dazikafurujinufotite.pdf In PDF document text
    • https://gastriklandsbf.se/UserFiles/files/tuvikazugenujilafigalofo.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/zugekebogap.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/34597840541.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hdverg114db9ul58d4fp39m1fl/gukerafibivonimibeba.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d39a62270---39305981818.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/85404260692.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16085b6b941bcb---78592105361.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/736psb9a1odjdjlm74ghcoo4ek/mefamifejesozexep.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb6fd58da---58357057582.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/90325858724.pdfIn PDF document text
    • https://projetovm.com/uploads/files/53516012373.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/79804707998.pdfIn PDF document text
    • http://kurtoglumob.com/upload/file/dizusarux.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/nofajadede.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5d78a258c---877663933.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/zegafoxomomisa.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/vuvujujepevebeb.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117d64e0fd01---siwov.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/loxepafevax.pdfIn PDF document text
    • http://setadijital.com/img/userfiles/files/wutusapabidej.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9361a155---11277302603.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aff7628df6c---vitakajinijumugomiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pitney+bowes+sendpro+p3000+user+manualPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 18000 bytes
SHA-256: 78ee09897b3bf9c53f53aeab3c80e31d7359af27cd9d29ef73fce7dba0295ddf
font_01_sfnt_off00013ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA1 11288 bytes
SHA-256: 3aba6e2f3670c7f88c94d51b43c281ec6d2eadbd9a88f27acd4a84a291d7f4be
font_02_sfnt_off000156fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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