Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa3e2e4effda988…

MALICIOUS

PDF

71.7 KB Created: 2021-07-01 09:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25948e71bff5ac2825acdb7d7f2e6e1e SHA-1: 3519f44bbd25137fed6f3a1c8d8c8933969f83e8 SHA-256: 3aa3e2e4effda9884f2aa661a87320482e998be795b2df85abe2f289cbd4c89d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware delivery, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://architects-desk.com/uploadsfile/40370416206.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607199d0a475b---73247467881.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///34248152877.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b35e18cd2e2e9dc4d2a1fdfce889b8c3/putuxujobixoromusedut.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9a81a1bd---kutixepurizedigisava.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/975093e41a9b4a5e1ad2789b64af4280/lazizulunulugufaw.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077634d23619---580804450.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb74b53da6---77234624344.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe2d763c0---59207079875.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210619144801.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/tukikusikukifijenorodix.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2165d8cac7ca6d48d59190d8f0c496ec/1952791504.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3483ca1f7f2c90611759333408fb6c50/tutane.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/kilirowe.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/3fjsn2abs7j7l8ltol667lm7ci/2033209506.pdfIn PDF document text
    • http://simonide.org/userfiles/file/tetefezozekib.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bf550c82---10639470229.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/42658838084.pdfIn PDF document text
    • https://bloomeng.com/uploads/solis.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/71792945021.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2004f1c272---tuxamatud.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/67433807698.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/49480506219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=answers+for+precalculus+textbookPDF 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_off0000b5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FC 10880 bytes
SHA-256: e3e052d9c93d5e577d333869ec23e166e01cb91274a13b43d76e33c3a145282e
font_01_sfnt_off0000cf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 16224 bytes
SHA-256: 92f889e3113991423e4f43355965d5a9c6abf8fb3af078262b9363fbdc6cb718

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