Malicious PDF — malware analysis report

Static analysis result for SHA-256 0786a141df8192fa…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 00:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f23f4c7431aa618010ff5ccca49f3fa SHA-1: db9878beb895928bcb958b4d7ec4fa7346cd6ad4 SHA-256: 0786a141df8192fad31de0a1c82cfbb9bc914976d047b7fe160b47e26be76c1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous external URLs, many of which point to compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users. One URL, https://infrive.ru/uplcv?utm_term=wordly+wise+3000+book+2+answer+key+online+free, is particularly notable as it appears to be a lure for search engine optimization, potentially leading to phishing or malware. No scripts were extracted, but the structure and URL patterns strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=wordly+wise+3000+book+2+answer+key+online+free PDF link annotation
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/50d22586314357db63c9554768ebfd0b/68083759511.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9uci05ogf6i6l7unfmmucn37sm/jugoduw.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/42468161731.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/66364831175.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/jetifovofomisedulamod.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109012134391816.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/62733846816.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/vidurugejodedizam.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/barifegul.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132eeb235505---gelukulobajogumopafepov.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/84967813131.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/dimopidi.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/84490644917.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/sowageremibol.pdfIn PDF document text
    • http://vititanon.com/user_img/files/16357484276.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/47372386177.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19ca69dbd---26904763552.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_329276C401C85717.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/25036604886.pdfIn PDF document text
    • http://dgkno.cn/upload/tuteze.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/lapujo.pdfIn PDF document text
    • http://topp.pl/_topp/file/zabewumuxivubunuzinabi.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/14733917685.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA9 20964 bytes
SHA-256: 504324774522c456934bbfb3cc2433249656b52ab5872b46b571fd7902f9e8cf
font_01_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 11088 bytes
SHA-256: f89e23cd06a99706a63a7d0a1a3c6e4f7504f965c7ceaf3d173eb9778316d5be
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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