Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abe68ccce9986bb…

MALICIOUS

PDF

73.7 KB Created: 2021-07-01 19:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80cddbd979abd5854c066ef8bc381c4b SHA-1: 56a214a64a257b58baf0965d56d08b93514f1562 SHA-256: 3abe68ccce9986bb0b861d769f9c7e2405e850a63fbd296f32ec16459b340641
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to potentially malicious content hosted on these sites. No scripts were extracted, but the primary attack pattern involves directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/vunizedo.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a60e8494b8d---boxuniwibidukuzugunilum.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/nipubog.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8nutolvjn90dfej21ivtubelot/6540552163.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be8b54cfcc---zalosu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/03f6ecddcd303c71da1eeb81003988b2/52677201244.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b666ca605f7---seragufavolexomuxir.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/54448492289.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/54459c612b5f285057b57d9adb64e4c6/3344004069.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/43bd86e9eeacc0487c2cb61fc54bf112/29357014773.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rhiarrjailacimb4gde9lc29st/8551178601.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec6fdac7db---13996002996.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609052c9284d1---8833581101.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/710e3a22ddc9e15094417cbcbbdf5a4a/76062700061.pdfIn PDF document text
    • https://adikkedua.com/contents//files/86901236181.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/9931256198.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/gakosepevesel.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429031117604642.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cbfc7e3ad---14801962707.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/45868832475.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b25e48f7e---21109597093.pdfIn PDF document text
    • https://maclashoes.it/file/wufunemefavoget.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t9au3df2o12ma5bstcsh4ikt66/retedugodulasakev.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/zipanemomosedeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=violone+in+gPDF 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_off0000c278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC278 16236 bytes
SHA-256: c8be500fbb7a2b49e626c53362a80815a23f6cb5ece3d25943889506bc24f2c9
font_01_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 9724 bytes
SHA-256: 4915ad6d66d3e0f754b0ad1b2cd243c7fdf83d9ccda0a97e6bf9b7f70b9ddc6f