Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e6d7402cc10a30…

MALICIOUS

PDF

79.8 KB Created: 2021-06-28 07:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 585eafcb6003fe6fc16564c871b4f264 SHA-1: cc346840c224d205d04e2a08e3a259368d4e9419 SHA-256: 52e6d7402cc10a300d6c48d560a4c81592f21a5b7cadc5b8a1d545e6bba17d82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or redirection scheme. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df5a5f3d75---8989169000.pdf In PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/cc0c3d0ce61c28e363041b169dfcf2d1/29826330635.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f4dit6snv665gk030668jh6mp/jazubotixidewagesatevomi.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/2e968dc384f51cfd77cb3896c323e09b/67296036380.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba09bd6fcea---52242914171.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8406e7ecf8d28aee78383f2a4c5e1a90/xeloridaxupowogufed.pdfIn PDF document text
    • http://changecn.net/ckupload/files/30603363814.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/wegefixezu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/vom12eg1p2nv8skq27ga535l5n/xatedipupigodunuzif.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b684b9c9cf241a99ca5bbfb158b713e7/bupoduf.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/fb8a49823dd510d36634095d9ed2b48a/94871026479.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/milimilezimevelijokabuw.pdfIn PDF document text
    • https://tangente-mag.com/img/file/94503030395.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3aad65409081c173a5a7cdd0590451a8/texaminazegede.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b546c1ba---pokijivuwasinumog.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1323cc532---rugilokute.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5b9adbg51l0l7akt03ksbg0uc4/70357403728.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/motemin.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e4b979f53---ramililuvujomifiw.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106170830242482.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ae434985ca9---zezikokuwobufiruvofud.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d022e44b87---loropoguroxiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sample+paper+of+social+science+for+class+9+with+solutionsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fd77bd657308b37424c14b527c19c49d/batapele.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_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 17320 bytes
SHA-256: 6f0caa6aac06925946da0ce296408f37ac369198d96fa0410791ee0a3269e5c7
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 11176 bytes
SHA-256: 40b0ae1e5b1347b14e08c2a021e2f6ae40952d9942fcce8ab93554cebfcd5873