Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae347cc38aae9913…

MALICIOUS

PDF

69.8 KB Created: 2021-09-09 16:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70cc71b7ad6e127deb5f5b394b27313c SHA-1: 72ce3bb0c210506a93856b6161ea3bc60461c259 SHA-256: ae347cc38aae991300fb9b39e76c42f663db88f3a1e7bc39bddb985c2caea879
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=fifa+2009+android+download PDF link annotation
    • https://nbcmedia.vn/ckfinder/userfiles/files/36750867546.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29368914393.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/37895198364.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135344a983e1---92631451453.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/47659188498.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361875e2b1---16808089813.pdfIn PDF document text
    • http://sdes.in/uploads/gozowonono.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/44713865930.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/wilozamarotenej.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/35382338134.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/purorejokopupodaj.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///54639249013.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/kujukiledadedewilit.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/43302448268.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/tijofodijejurapekaf.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161330e6e74ae2---tujalopezukenopi.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/kabatozi.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/45577499990.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/pepibef.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/55912802301.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nomuxawaxazenepakis.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/xosuwa.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/xumeduxuruxalavososilum.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/40750494348.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_off0000b3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F3 14976 bytes
SHA-256: 1418186bdf1168cdab07ee19964064162fda2052f84b56e60998967f16276956
font_01_sfnt_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 10420 bytes
SHA-256: 00027111f054e31652657bbe352c38fa0e193c9b976ce62ed636c0d644febe0f
font_02_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1