Malicious PDF — malware analysis report

Static analysis result for SHA-256 6089a6e17878e25d…

MALICIOUS

PDF

69.8 KB Created: 2021-10-04 08:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc1d8546d8c9969edb61d266fc4b5669 SHA-1: bd5b5319749f8962db4500d4cfd8beb4707b0be5 SHA-256: 6089a6e17878e25d66405963bfff5d87efa14111ee3294efd8a7b4c1868da320
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the structure suggests a malicious document intended to lead users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chiari-web.com/ckfinder/optimist/files/65606454904.pdf In PDF document text
    • http://ampletrekking.com/userfiles/file/xanifajovunuvonasinaf.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/wagowowibitenabu.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e6ef1e247e3bd2a2eb189053dfdf637f/72098305613.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7d92e258e6d196d84ee0125fc5239f50/43741542750.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/jaxinuwojegema.pdfIn PDF document text
    • http://sentralperdana.com/file/poxesidexi.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/195fcd4b63a7d8402172cdcac686722f/fuwatojimelenonevez.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/fewalusabowawukoja.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/rexesivaperosadutekajup.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/49c094a62e9e0513719e7115e2a121a1/80840118025.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/56853294034.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/m4cpklacpa29ua5r360spp7719/vijekuwidadebupoximab.pdfIn PDF document text
    • http://hoogbegaafdennu.nl/userfiles/file/mizemunomon.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/logukurenuluzoraw.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/mawediliduduxavimu.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/52662236637.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/zawasixigibofiwuwawim.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/navinunomap.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/murexewerugesika.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/sofebutezivenugemudedan.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/93255967005.pdfIn PDF document text
    • http://crm333.com/documentos/file/99466048469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cool+water+meaningPDF 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_off0000af85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF85 10400 bytes
SHA-256: 8eacb288c40b1ecdf58c67a432a18b1d34706df6ff831be132387deab3e52bc2
font_01_sfnt_off0000c71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 16708 bytes
SHA-256: f097e8e965f53dc5fc053abf6cfaed6b72dc5dd54474c20252f74714b04a0675