Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0afb8aba4d97469…

MALICIOUS

PDF

127.4 KB Created: 2021-06-25 20:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a41a3a3b5c8ebcdecb9dd9231fce4307 SHA-1: fa22da9b6a1e57504ae39553a163344a78fb425a SHA-256: c0afb8aba4d97469a725cbc6a6bb627364291ae0c128009fa609580653b6ffe4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including malformed streams and a high ML classifier score. It contains numerous embedded URLs pointing to compromised websites, likely serving as a lure for phishing or to download further malicious content. The presence of these links and the overall structure suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://catamma.ru/uplcv?utm_term=dr+gero+red+ribbon+army PDF link annotation
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a1a0da58---68191392286.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87a3319b5---91127943799.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1f521e91---83155995766.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bbc3b7a89571eea89cabc88c3371c776/rirov.pdfIn PDF document text
    • https://tavio.ru/files/file/kadukemopowotafej.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742d5a7ab6---xenokaxepazevogosub.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098956c45984---sugeguputarizuvepinukulim.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/25604028186.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0964d8620e4ebb1a54eb6bfd9a7d400c/merelazatofewomupenal.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/11162061128.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce914a05b3---rimusuzol.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/75893238347.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/iglb7e5apkvh7ddbrs47125ru8/wawamufi.pdfIn PDF document text
    • https://cristalensi.com/public/File/bomed.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/6057926635.pdfIn PDF document text
    • http://skupka23.ru/upload/m/1957125389.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c1f0e7283---35129914992.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bff35fcc6ab---83063366239.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abd99fe55a4---xifusede.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/8397003039.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/1a8e923771a3a3d72b89772d2f56df49/92046384960.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/8ca810980342daec95ee3bf86262622b/netubokogelomozigefax.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a622cb76fec---93545995703.pdfIn PDF document text
    • 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_off0001841c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1841C 2996 bytes
SHA-256: 47331700d908c02373bd62cd8998e3c84f50e95a200b2b64b6f7642d31c13d2a
font_01_sfnt_off0001909a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1909A 10536 bytes
SHA-256: b40ec22572794838f1e079d155788bbbcfb6fe4fe9667465a1b382f78e371cca
font_02_sfnt_off0001a84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001c060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C060 18304 bytes
SHA-256: 7022cd1bba2519383cf5c225120c362dd069a0ce61919927e415ceb09671e3f6

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