Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d90d45e8eb8fc3…

MALICIOUS

PDF

82.0 KB Created: 2021-07-13 02:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2b881347a44f9a77977b8d3b21c7805c SHA-1: 3222888ff686fb7055def416c14a0337448b7af0 SHA-256: 20d90d45e8eb8fc37150600942f7624ad9c9e2f7fbde09342e5a980546050345
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links, several of which point to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of IP address literals in URIs further supports malicious intent. The document body is unreadable, but the heuristics indicate a link farm designed to host or link to further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5b73c623---jifibadif.pdf In PDF document text
    • https://szekszardportal.hu/userfiles/file/46839496403.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607291367eeea---82873807058.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/15855024896.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/xunevuzeragosorowakuv.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/68093994863.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/n38l6um3bj8al86c7ui75eo1mt/fugesafate.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/lupimawepojibeligapuxali.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/46834145661.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5uqemk4dsr8fn463h2n25t0ebs/89006176425.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/94520446087.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeccb60059---88813758410.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160813e3382682---9102172062.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/gujokuripesojeke.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/17528471280.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210619_11594.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/lokikipezogopesojawo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c90707f6---tuwuvabogidipuwusesasan.pdfIn PDF document text
    • https://fasaac.org/temp//files/kojasapekawemijalugilam.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/59738257310.pdfPDF link annotation
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e5763d36---73720816816.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/21b678d4e179636a74d6577693adaed5/46524781434.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd2e699fa---jejekidimoramokorugi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4be71d9231---nawijitupagakoxa.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948ec742b5a---lugorebamalatobubejunosa.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607864c567d26---38286641961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=brother+8510dn+manualPDF 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_off0000da9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 10924 bytes
SHA-256: c50d8d777986e43627a215dc6069605e81eaffbc92637f852ab88288b3c99717
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 18112 bytes
SHA-256: 6184d3ff14d415daaf78cdeea2f8f564ea44b473dfc7b0e6acd3fffbef1bda05
font_02_sfnt_off000122be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1