Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aaddc4615d4d1f7…

MALICIOUS

PDF

93.3 KB Created: 2021-07-04 02:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 812e706c45edeb597052ced13a825af5 SHA-1: 933daf34078e293d962bb3ee6effeb17cc48fe16 SHA-256: 7aaddc4615d4d1f7713a10b4ea6c007d497c372f8b90865255d92971d1579164
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites using the Formcraft plugin. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=no+one+else+can+love+me+like+you+do
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085662cd1f5f---90718713253.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b794f665---rufanilalup.pdf
    • http://fenotropil.ru/userfiles/file/71022341974.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085722bc2aa2---kewudoxaxudamezobak.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080d7c668898---8271901489.pdf
    • https://bitree.ru/ckfinder/userfiles/files/fawonaditujom.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/xazisotewudufamogula.pdf
    • http://suttonoakfarms.com/clients/880813/File/ligigo.pdf
    • http://www.aqsclimited.com/EditorImages/file/wolejemijovureva.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/s7vs1qho9c5frsaviil6j44re1/sedegimi.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7ed41836c---pugokixebisegud.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f165b6dd82e60c1b30c98a263d4b3686/19660507529.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d633ae60140f53018bb2ea44c5794343/bawexupenupugel.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/0a9ccf102c407832451c0ad95acfe1fe/nupirifabimetanigepume.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49bbe73d4---nogusupewagebuvokozuzo.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/fjeaerfvcellamge4lc165las1/81545091712.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/18aaf7c61553e5403d9581442e2f0974/88029375751.pdf
    • https://activepymes.com/pub/file/debebamuvufigete.pdf
    • http://kppzp.pl/userfiles/file/vesorijuwubusafugazazem.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/306eca75e036cef0d2423abadf949be4/nibusipeja.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/bt7oqobmlc2p7pq977sjvdr4e5/39496965241.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/betanutomaf.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/fa36c85aac046cb8d79560182f0feb2d/46387294344.pdf
    • https://brakos.it/file/vixojatirefotatop.pdf
    • 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_off000108fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 16792 bytes
font_01_sfnt_off00012112.bin
63807babd2ac2a8283a5fa39eb96e1e36aa0cb0f47da95c3e508651a76302cb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 10680 bytes
font_02_sfnt_off00013994.bin
9fa7fd6d288ee68790f1f516ea71403d18778367a178b097e11b1736b8cba0ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x13994 17260 bytes