Malicious PDF — malware analysis report

Static analysis result for SHA-256 0424c1c6f2b28fab…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 04:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 577f120c9de12c4bf26f36ab62c6e193 SHA-1: 083deb40a325ddcae3f498eddd3f5265765acf1d SHA-256: 0424c1c6f2b28fabec762b456ba0d82dd3eeafa89df154b1050a1e78d63219c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a compromised PDF. Multiple heuristics indicate malformed streams and link farms pointing to compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16103f6c0f2be8---wedezirikavidadep.pdf, are likely used to host or redirect to further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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 http://nwatchonline.org/userfiles/file/44406235517.pdf In PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/afadde8bee940a2ae8c845b9239ef999/72716686385.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16103f6c0f2be8---wedezirikavidadep.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/bumudepupew.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021642345135711.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/39488511892.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/nowutelevijawugikatatipe.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/corbvgsub9e3ut9gucrt02puj5/52456708033.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160750f4038fc7---tozilolo.pdfIn PDF document text
    • http://usa-ex.com/images/blog//file/82283365890.pdfIn PDF document text
    • http://cutskytools.com/d/files/nukarize.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b342560fa6d---59165589289.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/pipezutuv.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/33538752862.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/ca2d4c64dba561d47bd738955c665eee/69809526748.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/73519695891.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160783cd033150---lotig.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/31057968655.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/gejomozofa.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/275a99c7dc31b9645d132790751cb873/luzasimipe.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec24e3f872---80291690403.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e13c122fa---vewivekejurezamagus.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/vk9pejdoqvp6o8ks81b0n8a9b0/parurupavivebonosup.pdfIn PDF document text
    • https://camelcarpet.org/d/files/kesagatirededudat.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/3392eceb42fbd2b1fc628ee00900ece8/wuzipedulop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=basic+plc+programming+pdf+free+downloadPDF 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_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 11004 bytes
SHA-256: 46d82222da53c0fc946b32c0700aaab81e82b66e02da06039df1ead47d6b9e62
font_01_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 18016 bytes
SHA-256: 7dc447d6701de7cc1e7e8064fc121b3932e8929f7d748aee6251ebad326f9605
font_02_sfnt_off0001340c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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