Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1ae175d004ea76…

MALICIOUS

PDF

88.6 KB Created: 2021-07-16 06:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d519089be79bf710267d5a52269fb661 SHA-1: 8c2be4a868a1e434ef2c9ab04d114844caafba00 SHA-256: dd1ae175d004ea76c0eeed31de5126ba39ab391b7e96026d3bf83bd796d961ce
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or SEO spamming campaign. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and URL analysis indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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 http://tgtech-auto.com/userfiles/file/razorifuzune.pdf In PDF document text
    • http://amoy-art.com/Upload/file/jenogemamawajapazizogewor.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093af651e2b9---mibonisibezinolazuji.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087de067915a---tatinij.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/80d8ac75b1e32b8d02dc7dc19387e73b/mezewerazabas.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/48882197304.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/nexixanipiminumosavalumuz.pdfIn PDF document text
    • https://areicon.com/images/file/wopul.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608035956b870---simegebipixikexoxop.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981587af8d3---fapidagutovizezokigetos.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4be202ee8---zumazidawepofosirefeb.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/vesip.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/60407913325.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/914a09380e9a172f5312de370d450b90/mujamegoberumodezodiwikiv.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b481b806d05---18493503569.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/wotodupenaniw.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742dd14d805---pasabobukotadunapa.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/37415714753.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/24873755261.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c14cc2e34d51992d1bed23d99e4375db/fojafabuzadedukukunizeka.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210704_37D06DD87EE263B5.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=game+dev+with+c%2B%2BPDF 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_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 10288 bytes
SHA-256: 4ac7515ae7c90a807a9d8aa84a0386576291b62128298271ada7d6a17a56e757
font_02_sfnt_off000126b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B0 17836 bytes
SHA-256: a607f1298e4239c4fb8db43ace4004bf29e8cba2324b21d4fe28a46f964351e8