Malicious PDF — malware analysis report

Static analysis result for SHA-256 d549b06b807afa4f…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 20:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cce64babb6e87eec8b541aa92e3171d1 SHA-1: 4551af6988a748a71743a31cdc1ef9fa6c6f3bff SHA-256: d549b06b807afa4f33953d477ec67b49db58beb2d0658015fdc512918127027b
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users to malicious content. The ML classifier strongly indicated maliciousness, and the structure suggests a spearphishing attachment used to deliver a payload. No scripts were extracted, limiting the ability to determine specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/875ef52bd6c5fbc7fd160c4c21553d22/fifatisasupezomalakewowo.pdf In PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/polawedusovu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/53c6b94992bd7cf0d91d23c528dc4d76/92983285118.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ed2acf71047504e372461de14dbd0e2c/nemijomow.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a65a5d6c27c---82313037580.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/86741389095.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160857b9c33dd4---tesiperuwokonu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/cf79343e03bfaee8c4a374ff9561964d/zudezefabiwuduxoxa.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/00d7d34813bb862180c7694fff0cbb23/64927220830.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/88a1kjpmrunlvdpivlp9ekelj5/wimuxikalutofesuzur.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/75471709043.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcfd7b9aa2---sidebubivegedejapemivepa.pdfIn PDF document text
    • http://pneusmarene.it/images/file/tolizalumebogu.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/56367454380.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160981e32d0304---76187333776.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noseb.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/80222013504.pdfIn PDF document text
    • http://hifimarkt.eu/kunden/kronhardt/ckfinder/userfiles/files/845077642.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/8c3869ef4faa69ca5140be9789f53927/52777928971.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/df8a1cd00717bd823a8cf7846c8e80bc/39135378359.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/971ffe65307ac4cf0382594963560920/dulasimutibezesubofifexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=que+padre+in+englishPDF 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_off0000e7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 18688 bytes
SHA-256: 5c1c3c5570ced8bbbe23c0cd0885e0bb57ea6a519135f69f61cb78fe92c94c2d
font_02_sfnt_off00012f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7E 10612 bytes
SHA-256: d26cc8eb7820ffb175f3205282b6e3931625074c3c8a3bf86da9585b2268bbc3

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