Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae27107d297a0cf…

MALICIOUS

PDF

113.0 KB Created: 2021-09-03 21:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37c5d9cdf38eff10ebe6a0075307dd1a SHA-1: 923ef926385324c94269ea3793809dd34a98e152 SHA-256: 1ae27107d297a0cf4f03944bef9d70ce954c03dbfc83c75c6c82481177d825ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure as a link farm, combined with the compromised hosting, points towards an effort to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/53762634366a79e7144212d43746eb3a/30820986312.pdf In PDF document text
    • http://ahlhy.com/uploads/file/011229585656.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/74het22e23p71jl6otphoscnak/tawawisojaditepejurimeba.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b4d4c1e2e---54244407864.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/15150092185.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f499e69cda---posalo.pdfIn PDF document text
    • https://laps.pl/userfiles/file/81237675253.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/rijakanituvatexefab.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d44b39eb7d1ad4c0d4f89026dc542d3f/4775517088.pdfIn PDF document text
    • https://clove7.com/userfiles/file/dizaneluwisipejuwapaz.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/gazubugefebufedogejevi.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/retulejanajodusevemoz.pdfIn PDF document text
    • https://sapporopools.com/contents//files/nosuzixokaxoz.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210704125316.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/5458245437.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/25649956853.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3fc4fab7a463ef592841a33556ad3bb5/40156490383.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/n1kib3m68afi30b8ch35im41v3/xuvuperevi.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/caa95ca7e2840de5a397baa805aff7f7/2635824859.pdfIn PDF document text
    • https://campermagazine.tv/public/file/44734272295.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/78557710340.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6be2f6315f18f5d096dee02cef6582b0/7329115250.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/31048576368.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/85912074411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=acca+f6+past+papers+pdfPDF 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_off00014c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001646e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646E 10400 bytes
SHA-256: 0cdc4777fa4c2ad0d516af0093b8727c1b69c204ccb700b4123e68591460d0c7
font_02_sfnt_off00017c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C32 21948 bytes
SHA-256: 1d403f8e77a34523f2b467a1346683253bb0d63d50c987cdce4aa3298e4b02ae