Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bafce2560cde8ca…

MALICIOUS

PDF

97.9 KB Created: 2021-07-24 08:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5f7d995a513904ecbc42b93bd5e1124 SHA-1: 47c835d22762a26aafe6361b95d1260547b23776 SHA-256: 2bafce2560cde8ca86439b46915697d9ee7cc664b2639062791c2444e97e4072
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the URLs and the detection names imply a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://savages.lu/imagesRTE/files/dubezexu.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ce8155da---80175233588.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/66709016178.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/74551513235.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4ee039fa---gavoxa.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/8617499944.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/98711888029.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608645008bbd2---16123372640.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/41222483079.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/csou2cbuib1fsj2nksk4fu92t0/16577979500.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/81138839060.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca941261a5---19358875901.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/puwudamofezenolitikex.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/513aee1efbfbb70028ffed12e818553c/fimalavipexejelonitoju.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/lapewujalavujiwuzowo.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/80706087426.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/kadifesibewajupenafod.pdfIn PDF document text
    • https://sinarwaja.com/account/files/74850976350.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/2686373181.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/rupuboxikufusunexajawaxas.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/877847624.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/vidusegewomojexirapo.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f24e390aba5b82116562102445f108fe/7057282.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/tewalufesizisusoroxa.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f954c1795---sarozini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=4th+grade+math+spiral+review+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_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 10856 bytes
SHA-256: 81f4e82ee909815ccfeec4cd4d16f51050bbff49c3a4adeea3fba9fa33c76c26
font_01_sfnt_off00012e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001466f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466F 19936 bytes
SHA-256: f0ce43be423c5253d697eda16e1d3e727bb75b53e1322cfb01d115e6129c44cb