Malicious PDF — malware analysis report

Static analysis result for SHA-256 25703418e095b9f3…

MALICIOUS

PDF

90.9 KB Created: 2021-07-07 23:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b43b1240ca1919ab444a957fbee15a88 SHA-1: 8b166d7f4d56025fdb93bf4fe7c5d34103262074 SHA-256: 25703418e095b9f37881e86705c9866867769b6cd9bbd9fd1ba562c945b9b3ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous distinct hosts and the use of UTM parameters in some URLs further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://modnyi-buket.ru/uploads/files/bonixopom.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e48815f201---70107528026.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/11247588305.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6aaa03770---90862962358.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/konuxaluvi.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/pexapus.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0513haf572piifgan2fjnbtj24/satuxefo.pdfIn PDF document text
    • http://fygl.net/uploads/file/110132413818.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a7695611fd5dc66973efbe76d3bc3f68/93412553795.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/minubefigufazofalifovumo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bb6e36884268cfcc2a280f1c00be0804/murunofalavidatatovisaxow.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/dh2tmre9rav71ne2j6220jib9e/8895036685.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/15894525915.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2c3ce769a---burajexum.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091056b71251---97078697199.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/4864767010.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/83801649881.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b23328b7---vubajamaru.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3d7dbef2264db880ed18bb131afaa69f/xobawavulosilolexevojipi.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609279d46a487---gepogaxosu.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9953d89e33a902ffd8e267dc4de5326f/xebovasexekalesovewi.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c0c25e9cfbe5c60e9eebf7cad1fa6b6f/72042568222.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/71755399228.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/0262231ffbd7ae615aefcd4e63d21436/17544359291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mind+and+consciousnessPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 16996 bytes
SHA-256: efc8f44e0999f42cace73715eac26989c1693ad763d46fadee587896e4dd2058
font_01_sfnt_off00012f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 10212 bytes
SHA-256: 8c13694ad1e628b1416e4d485fb7588657f5dbfe811ff90cb043c6ce1b5aab95
font_02_sfnt_off00014630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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