Malicious PDF — malware analysis report

Static analysis result for SHA-256 a941894600d28517…

MALICIOUS

PDF

88.8 KB Created: 2021-07-05 12:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95bf8117d8c409f9aedeb02bc429ccc3 SHA-1: c5b1b00d0e85614c690e2ed1760800dc097fbff7 SHA-256: a941894600d285178cb1cfb9c44fb02f89c2cf4c29e244492e62b0e722a9f664
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 numerous websites, some hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute malicious content via these links. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://immobilgold.com/file/57559989937.pdf
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/36185557042.pdf
    • http://newdimension.su/userfiles/file/kibinud.pdf
    • http://opusincertum.it/userfiles/files/lidosifo.pdf
    • http://alarcon-v.com/editor_upload_image/file/61635209764.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092159b52eec---44481420696.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e51ff580b619c717ee7e1e2649a0e979/lipakekerunufix.pdf
    • https://ludifrance.fr/userfiles/file/xalokixubirepeleduvelaze.pdf
    • https://coevent.ru/upload/files/zofigot.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca02e92fe3a---mositaxivilesiwab.pdf
    • http://staractivecollection.com/resimler/site/files/77843024905.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cn1rp1ag2acufjv76qfd5d16u1/59670105410.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e527031c9acba23b6953fc4d5a5f65d5/357025636.pdf
    • http://lordbeaverbrook1973.com/clients/76835/File/42781489175.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/085dv1j4hlk48q2lkaqul5b44g/74744796392.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44e3a8703---wupepadanowarevorupuwix.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873c1a54cb5---jozonubusafezo.pdf
    • http://darec.sk/files/files/94974718014.pdf
    • https://classconnbio.com/img-jacson/files/24614253565.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/isonktpo0bfrphoigl0go9r8i8/befakajizojek.pdf
    • https://al-farh-iq.com/upload/userfiles/file/79009078644.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/fogosuwigojitibavil.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/4c04de518543dfd8c8473bd2afb2993b/80631644577.pdf
    • http://xn--xhq021fvrwdth.com/d/files/49171620502.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d52b8f539---vikalumudi.pdf
    • http://astro2sphere.com/admin/images/file/lazokelaporakenizeda.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ielts+speaking+topic+part+3
    • 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_off0000f918.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 16792 bytes
font_01_sfnt_off0001112a.bin
bf35bf520424f9778ccb9acd6086adc0140b53502b9753594ea3a84858a9f042
pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 16972 bytes
font_02_sfnt_off00013d37.bin
dfc99cc6e0e1a1938d9d9e802c4fac878a7811553564938b2b08a4f679e4b6e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D37 10764 bytes