Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42996980e2b85af…

MALICIOUS

PDF

93.5 KB Created: 2021-07-25 17:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1fb0ec0371df35b0c200f6b9e926f6c4 SHA-1: bfbbafc759c71d492cfdcca3247cd19a7ad1f122 SHA-256: a42996980e2b85afbd843c51b54f318d53bfccba7e6b2900adec8509add1e371
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbba352c865---tininotidosulokofowuw.pdf In PDF document text
    • http://bogaarchitetti.it/userfiles/files/govaze.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202105300850434073.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/85558933310.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/255722106.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/33172815678.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/supemivanusu.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/18628564964.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/gerewo.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/futikiw.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a71e190f0b59bc0e709480b9566e337/mepajozimuzo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/vl5aeb00c3mm0e6tsgv1vqe7i6/48328275530.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/43644878540.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44f0aad87e---41554082577.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/57459121660.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/63d1c89a81a19778b13ffc47fb748b01/mumimunabajogo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/der7sljaa92h8o51kmj9ruc3n5/botavuremiwubiwovuvij.pdfIn PDF document text
    • http://swadeministries.com/pastor-sammy/upload/imagecontent/file/62271816171.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/gifarukemukisimipudilaj.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2bad14e1d43e429ae4e266a8ff1ae578/55270334492.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/308747fe79f673ee78c0df919d7c1fb9/7746398551.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/31716169566.pdfIn PDF document text
    • http://jarosi.hu/files/file/notatozabasulofowuni.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4e6041d3de2506f199e6fb318dbcaf4d/vakegeresurobawosekabu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3cf5c7805---josutokeruzavagokugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fast+and+furious+1+full+movie+download+in+hindi+dubbed+720pPDF 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_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 11476 bytes
SHA-256: 0366fc4015398185fc87ef965a6e52bae00031034b47fdc242df35c114bd3114
font_01_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC4 17164 bytes
SHA-256: bf0ace92319d0a436191b12493ad588aac61091633b684ef3541d6b4631f5371