Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fc2b506de78ed7…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 12:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a934359822209319522a9576cb0092af SHA-1: fd05afd45514103eeb95070a65944d91fc2f19dd SHA-256: f6fc2b506de78ed7350b3fb58de339b0beb2ff4de07e572407e0d6941951cbf1
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to external sites, some hosted on compromised CMS platforms. The PDF structure and embedded links suggest it is designed to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lecapsuledigian.it/file/jasilak.pdf
    • https://matrainagycsalados.hu/userfiles/file/risasugumojin.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/bd8fr6eevjo5mgi8qf056gohch/ditakefa.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af47697c75---92530066237.pdf
    • https://cochleartudaskozpont.hufiles/letisafaxubox.pdf
    • http://foto-klub.dk/userfiles/file/xubujewewa.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842e3d71d3a---jesuweluvazi.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5b8f162286060d5f28bfeef22d2633ed/sozezefosagaxalasuvu.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/runupunisaxi.pdf
    • http://zwickerfoto.hu/_user/file/vojobav.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/funekobavubus.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/4787233becb41f0ad7f7ea6bbcfedf63/24875015253.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/japunatifetopitavefir.pdf
    • https://nhachoxebus.com/upload/fck/file/84929394037.pdf
    • http://dzwigipoznan.pl/userfiles/file/vonatozetigasuwuwelaf.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/kubudataxatem.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/pdli5ej0fp0vqb9d4prhi5j115/97300560041.pdf
    • http://tomaszfilipczak.pl/userfiles/file/69210520636.pdf
    • http://www.anclupnapoli.it/userfiles/file/32874741458.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04a6404cb2---duxetodumomutubulesupewij.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730ea89ba14.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750e15cc78---38412712074.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/0abae0df1b2c7a97062c614615756413/73355915036.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2tpoe690bn4ucj71iknhn2tni1/berubupuxulujixe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=quotes+for+self+image
    • 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_off0000f251.bin
9eb44e21d6aef57aa41b69b0e42b67c8da72af6e94fab49d9634f57cef9cb542
pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 16996 bytes
font_01_sfnt_off00011e35.bin
432be927f54d4ef41618c6e454a4b06adc136b4a0c7f767504f35f8e66f413f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 10612 bytes
font_02_sfnt_off0001369b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1369B 16792 bytes