Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4d6073f36046dc…

MALICIOUS

PDF

88.0 KB Created: 2021-08-02 09:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2473e3c3c70f30c90c6a9ad5ccb9c405 SHA-1: 4ca3793924ea1b98a3bff5c357801057dcd241c8 SHA-256: fb4d6073f36046dc3b0c51990e3718de6c97a92c4c5fa906ef2f8d04ecdf6dc7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm behavior suggests an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21191722105.pdf In PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/d116d4481f40267d453a2e75d225adcf/58017473991.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/sf01fja5ndon6q7hgq0r3k326k/43062474842.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/gumijidapowivitipolexulax.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/28080803011.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6b79fd7ceeff5e82a868c579f6db2f9c/91870080602.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a09758d0---zejuwoxexibonos.pdfIn PDF document text
    • http://24cvety.ru/upload/files/36337891475.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/71819447177.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7pm04srbsb5me4qiuiqmcttf2k/nopejotuxasigemaxuza.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/dazovapisadiwele.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afac1658ad0---zubunivebujimufiwo.pdfIn PDF document text
    • https://airshow-bg.com/file/78570746786.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/lulubazumufififudugi.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fae9640501a455d9fd022ee65a02bf48/54631720021.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/63210338532.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925a78e3da---83782646670.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ddrae9pd1dh962v02touqq0qk4/55934698107.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c92b883b2f---96859550793.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t5bdb7s7d92p0mbc14pdf28kk5/nobunaxize.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/4325632869.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/lowivunajewa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d9435c17---lazenusa.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/40311980706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dark+matter+book+review+guardianPDF 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_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 10864 bytes
SHA-256: dde1abee9e1d122fdcb715990132dfa3271c7ca26a12651f679bfbc3b1af4ca6
font_01_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 17604 bytes
SHA-256: 5b386e99a415a2a855020b22911b96f868f8ef98eb35fd0d8abd0d0e27a39d91
font_02_sfnt_off00013820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1