Malicious PDF — malware analysis report

Static analysis result for SHA-256 9570e5fdeaba812e…

MALICIOUS

PDF

103.3 KB Created: 2021-09-05 00:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5887f98f35dc4d6713e93d5168fea8b8 SHA-1: adbcb868bcfd195207701aae5471e15f427c691e SHA-256: 9570e5fdeaba812e8d294a0df377a0180ac3e80d4209f3a570de2b2702201ee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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 https://conexkarvan.com/cache/fck_files/file/53513139685.pdf In PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/90224828731.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/xovuxetofosabaded.pdfIn PDF document text
    • http://midel.me/userfiles/file/57133250526.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/18864305295.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aa484434e---zakozavifudu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073fbf7d1b36---36548914232.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/2a3c45ab57eabd78dc0ad4a7737f9fb4/49574353074.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8aeef5f5---wuvasabiki.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4f0add2ca6760bbb3c9c4ba7bfc68c44/28389057651.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/cb8rhqfrqacraeqqm16p784ck3/60922760617.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/dipogisubipi.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0648858e6---rolusaxaniwavuvogugekabuj.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124b58be5614---rojusamivofadaxiju.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/72888643556.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/43252200798.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3bae5630---tijimebof.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cab83ff79---44174516798.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/50603714738.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/baremudirusu.pdfIn PDF document text
    • https://htchninc.com/d/files/61652086745.pdfIn PDF document text
    • https://moolans.com/uploads/files/lejenefilid.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/36989991253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tokyo+disaster+preparedness+manual+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 10928 bytes
SHA-256: 71f8229c9e2ccbde6aa1cbdd720127c0eb6f03ac2e3b4f87c3455b975c009dfc
font_01_sfnt_off00011626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0001362a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362A 16612 bytes
SHA-256: f2ada9836f5796b2b51a7874213e47627c6d4ee47077d4b203ff6f36006095a3
font_04_sfnt_off00014d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D94 25764 bytes
SHA-256: 69e9f1afd70106bfd68d0eecd233fae01d2a5633c142eea441719028a547e6e2

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