Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4b0704a3c58de6…

MALICIOUS

PDF

88.8 KB Created: 2021-06-27 17:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 26f57d55bfcc96fb27fac09f4c278b4d SHA-1: 8fa496192df215026b51b95e1230fbd53fae2fb3 SHA-256: 2f4b0704a3c58de65c276013ccdc6e1a560b8df60e1f193b770779edc5e0c133
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=the+ransom+of+red+chief+questions+and+answers PDF link annotation
    • https://aedwea.com/upload/foto/32597026228.pdfIn PDF document text
    • https://rajakedua.com/contents//files/mojuxobem.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/36075808156.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/gapusogoxefuxaru.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b62ec9372ee5566e859433f279b115c2/juvelabufefawove.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160753e815f029---90206392466.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/busopisunizoxomopasi.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/46452747358.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3db0c8d10---74819239314.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c16dea562df3bf32590f51959e342fa4/57189894859.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/94158528717.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/relatovujup.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/k19fabsvr4k1cps3sgn4jresi6/43376429935.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/tadosovusadetalileku.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/zufizakomatosaso.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d6402ffd934157f45669b4a29fc4fd37/31923751635.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1dd97b8f569b74a092907b727f408eb6/foxutalomofasorovuzebivom.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/aedb591eb6f4a6352e2ed5b7133b7bd9/86316834522.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/75950660815.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/k5pmjea6ps2du4j0mk3fb2j3u9/93234470835.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/bfee6ee6be6ac65334f6d4da6cc92f6a/43000912227.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/repaba.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/fd063ba89eda2fbfe1f105fc5bcd3ed3/mulakovademi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8b1a75dfd---muteximuruluki.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_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 17368 bytes
SHA-256: 71e1672a99d44af5235f45ebf21ae8ad09080fd999d9c92f4fef0017b98d04b3
font_01_sfnt_off0001246c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246C 10988 bytes
SHA-256: 42ca16e2a71b93264f76392d05a16fa7bff0c828a6f4600f3c5ae64fb41cf51c
font_02_sfnt_off00013da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1