Malicious PDF — malware analysis report

Static analysis result for SHA-256 f179c962107fdd7d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 07:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44a9b10ad4872a9e55e8dcf9e16a89cc SHA-1: 00dafedb4e1f983aee52d43f826b13adf94a2253 SHA-256: f179c962107fdd7dad7bc45c2c1181294fa53acbc8ca0fe3c1eeb122ba6e7568
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a common phishing lure, likely using a 'degree certificate template' as a pretext to drive users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://cncunse.com/d/files/tivudijipemubabajikefefe.pdf In PDF document text
    • http://leicesterbiketec.com/userfiles/file/17656795128.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/wezej.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/40072656909.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/71108021329.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/97470386328.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e3f39120ffb14289d31930684a2ccb48/62035662046.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/digixoviwu.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/goredojogevo.pdfIn PDF document text
    • http://normel.org/files/upload/file/lojudonukod.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073ad94bcbd7---36490636141.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/jebojupofukarixij.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f36ee60c06---9295360479.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/80485913167.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/vesikobibijovewonug.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/34813084754.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ace1a55cd48370d26e92abfa86512063/87915183022.pdfIn PDF document text
    • http://its-bulgaria.bg/files/file/repudusamomapelawodifuva.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/56285743716.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/61238964493.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1eb529d89beb0ae56b8227c18519b941/nowimaxeketazazo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d870f1ffd---69351567889.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e8122c52bbd---28317770707.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe981a0097---lotowufunawufanajosa.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f716ca2ac8---43791414023.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ugof7n9f7q0851lm2vjqip72fc/zosemexemej.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5fsmufk3skpgu0ubc7uhtd62s5/folazuwejuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=degree+certificate+template+pdfPDF 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_off0000d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 10572 bytes
SHA-256: b9ec1b353428ce53b2318309a40389be6e115f8b2264944f861a037574a1a9af
font_01_sfnt_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 16700 bytes
SHA-256: 72dc093974d76e8ab290695c90bed95b527fd9dd4552e7ea6086d0399a8d8c08
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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