Malicious PDF — malware analysis report

Static analysis result for SHA-256 55177219ea143cfe…

MALICIOUS

PDF

80.6 KB Created: 2021-08-23 11:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 750e74e7f628b92acc454fbb7d0eb7a3 SHA-1: 14a7878e2ab1d76ff51ee9bb02ada13d29eea54f SHA-256: 55177219ea143cfec5892fd75a4d1b8ce7ee1c4fa226318715c46ac1417efd74
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous links pointing to compromised CMS upload directories. These links likely serve to distribute further malicious content or manipulate search engine rankings. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.tahi.hu/ckfinder/userfiles/files/27860815395.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782bb671ab1---tepolitakogatapigivali.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/44454768811.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/arluac2c5n87iia2fe3v4l97ih/94352222090.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/19118552089.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927d10458fe---popemulesarubukevukaz.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/26605826126.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/73736736575.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b1ef26f183bf8f0151d6df5d09c58a61/wogegigejimudevojan.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/janemolixefegefodemudedo.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/gesawexibo.pdfIn PDF document text
    • https://eslms.com/userfiles/file/xarujukof.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4cadd3525f04be80c90a5faed8cd063a/zureturifenopowugalesika.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/614ecaedb88e385c85603b3dbbc4bfb0/mozuluwinipibawinovemejuj.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/zoramunup.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b82628d07---biwizadikimozaneruzomo.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/60991516729.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/8613142353.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/winewodiduzemiber.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20218231417328611.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/diwinasizudurixe.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11e4854ce1---9456198948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=quick+lunch+from+grocery+storePDF 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_off0000db47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 15560 bytes
SHA-256: 29e12ee02d284b48b6dcfee607048a530a25d4eeb024105f7bf4f42e9bd40366
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 10984 bytes
SHA-256: 8bcab27e16730d95ad568326c9d34ab24a6d296d931238f3dfd4dd46c5b87fb2