Malicious PDF — malware analysis report

Static analysis result for SHA-256 b707414453573125…

MALICIOUS

PDF

80.7 KB Created: 2021-07-29 19:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6d5286001daeae7442bdc995b4a2de0 SHA-1: 54dcbd5f58fb4c5ed27a0463d4742c786e0a9c1f SHA-256: b7074144535731258f296514d1b190baa18ad9efaa109603b3c02505f0057e9c
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs lead to suspicious PDF files hosted on various domains, likely serving as lures or initial infection vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a1320f0c4---28362491676.pdf In PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160faad2ac50f6---vorifomopafomov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941ec1414f1---varipuligamomol.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/26760124219.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/50908390182.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/49728328975.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2a634fc8---16977689180.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106301529351794.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/detulukaralutugawofevuke.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/76163793264.pdfIn PDF document text
    • http://ausafe.net/images/art/files/somewirumexazekaresasi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/78ef594dbe12166b36a14c4c62a271ca/vinogusedu.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/vukasezaxevodijawakurare.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b4748f33132ef5391dd8c50cabfa3ecb/malizenilufaxizuvufajeb.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/10673238459.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075db21479fa---77394062431.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/34478792860.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d785125a85117c363b67fb836e735c3b/seriwobato.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/safalitejuratisopiliku.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076de137bebb---46560920324.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9416983ebfb9925c42b199831cf230c1/93030192885.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/726bd58f21e01ec761ed65e2cf4bc1ad/nipepizafox.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/taxinozadaw.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607c190dceafd---76498948214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=descargar+libro+mec%C3%A1nica+de+fluidos+robert+mott+7+edici%C3%B3nPDF 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_off0000d05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 11428 bytes
SHA-256: aaf12ecdae9b0d1492e1cf6e048df536747b85190e842e90da147bf00b27244f
font_02_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 18708 bytes
SHA-256: 4e4190bc3459cda2be0c2d9943493c646b9b2c9049510ba45a8bea2ceb74e466