Malicious PDF — malware analysis report

Static analysis result for SHA-256 9883963ddcf25117…

MALICIOUS

PDF

92.6 KB Created: 2021-06-28 11:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 14eb853504e25a1242d59b5392d20512 SHA-1: 05e339cbf6dbc13b2bcd8de19b4dcfb127457595 SHA-256: 9883963ddcf25117135dbaa169cd56ebd9a396bf6c72c80c30592d2015577e97
176 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 links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of an IP address literal in one of the URIs further supports this, as it is a common technique to bypass domain-based blacklists.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.irrv.org/uploads/files/64008777322.pdf In PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb7145b81---jasafasexijoj.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/5758672858.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/6ko2mjgj94fm5he13i93r6uf5i/zowov.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd0c754e3e---42307736102.pdfPDF link annotation
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cbf6734b1---95960066235.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160901408af887---88010907329.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/vemirakogukitetajuzuke.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1624422936744035811.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/64764912923.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/1b9d9c38c3c3df19d487385a0761fb0a/44173837887.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ada6d3b7b76548dea500dca31092ae86/84429646477.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a74199e2a5d---femuduvidimisozamuxizi.pdfIn PDF document text
    • http://rc-modeller.se/images/file///37284645818.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/93b9789630463778afac4c6dcbce52af/jaxunubigerosumalexowi.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/4f0aa71795ac4d4cfebef40b12338696/45616970420.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d5863384---99902495362.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/luvexijifu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c389e3d230cc19d932834b2b1ae3a969/muxigerojaziwivoforanun.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8053b009---22634707808.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/65c7d258fe79f5ac49dc4975ed4cb41e/6333344372.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/43603838685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=apricot+streusel+coffee+cakePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 10544 bytes
SHA-256: 6d0f4197d7bdc223371c32d7267709bccfe7088b977c86cce2ddb2b8b74a3d19
font_02_sfnt_off00011df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF4 18092 bytes
SHA-256: a33fdeb287669dbb778198553ae53d6fdfee900ccf73d7f6717515858cb346a2
font_03_sfnt_off00014cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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