Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42f5c9a7a6b492a…

MALICIOUS

PDF

82.3 KB Created: 2021-06-25 21:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c44cc212bdcd8c7f741855d9bc6dddb0 SHA-1: da5566765a6dc29d6b5d132562caed1858abf7a3 SHA-256: f42f5c9a7a6b492aaddb7714357631834a04a996661cde0ac5f84efd0d87e218
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/6e272cb81b90d2c413e93488328c59f0/xibibivosipojiladigulame.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c31ab71ab---loxatenube.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5fc8264c0d145d12e9a6c67845e43b8/15957791923.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/12613221474.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c2089832f---wubadususenivubom.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/95163670755.pdf
    • https://xanbiente.de/userfiles/file/gerodemamafusaze.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/deeb3ae0d9c85c17438d94e3992a7a0f/kepefakupudopawubo.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c7d673c04---65064132056.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160769ea4ac0c6---dajamosopido.pdf
    • http://orderleesushi.com/uploads/files/21369315890.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a46f33d58---49551156805.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/gn7etmvr8d56vu3gkfqcjt5clt/wamivofurigisuxawevip.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982e52d3481---55206134417.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bcac8bd2b---galilus.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/95ca2d756989b4790fb835880e958a70/56568714847.pdf
    • https://guijek.com/userfiles/file/bejebizevekelobobenorute.pdf
    • https://skinrepublic.vn/webroot/img/files/dexemi.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608197ffe260c---dapijemovam.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kiwobomovinuretimo.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabb9497227---zuneponipej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+repeat+a+slide+in+powerpoint
    • 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_off0000df16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 16792 bytes
font_01_sfnt_off0000f72d.bin
8b0bc91736f8e3050a802659abf3b06a1e3ba8c10d34ad1177dcd98ff08d2b84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 10460 bytes
font_02_sfnt_off00010f03.bin
24a779bb3548cda07241a37adc5503468c39b10a7264ba44ae42bea6bb68ea72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 17316 bytes

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