Malicious PDF — malware analysis report

Static analysis result for SHA-256 432917a7481f615b…

MALICIOUS

PDF

74.4 KB Created: 2021-07-01 20:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6af57d06b0ec76b04cf7fc9cffaad70c SHA-1: b113175b5a51011fd694e42c2d47aada0b63cb02 SHA-256: 432917a7481f615ba7199972164304498c31572e03faa86f0f3ce773ef17fc70
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft or Super Forms plugins. These links are likely intended to lure users to malicious destinations for phishing or to download further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cructi.ru/uplcv?utm_term=nicknames+for+siobhan PDF link annotation
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dca669b41---batidajozet.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e02d5461c---66359031550.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/2efcff7808ca1fa772bce310b5cb69f5/vipamitefezo.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/2mu4tkres9uf54k7affiao0dvj/ribemoxu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/g9edsggdjc0pi7thubm1q4fkbq/3360996691.pdfIn PDF document text
    • http://ahchala.com/img/file/radidozodexogax.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/semepedobone.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f6cd454ab477a1f824d8092d055d1416/tolobok.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dae9130b6---54761745839.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/milibexaponowefi.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/44371981246.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1pv4pabmuu5s7armflkean5b6e/bulidulogiluzomipaw.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098a628276ef---buxiluxokozejefototuloj.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/80814246146.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/44594026767.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/bobafed.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/48273455059.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d9b6df9443088ba1a71c616637293c3f/1416156160.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/ledefijogemepusuxeko.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/22896175492.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d47b3b64a1---posakeninujirumove.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074806b5bc48---4404221866.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47b1147a6---xedilibaratevuwaz.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/gujoze.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/xosegizuxagojuwafuzizeno.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-12/20210512012743954486.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805bec11420---20418139068.pdfIn PDF document text
    • 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_off0000c10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD920 16556 bytes
SHA-256: f84b863396c82f599e277ec0e0df09506fefdda5cb2cc43506f262e9a406ef19
font_02_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 10668 bytes
SHA-256: acede385ffd8a9241c5e323a2c9ac3f9e9643aee0fb740a5901fe627d2d58826