Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bdf5dc61262810…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 02:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c753ea8e3e647a973b693a3a52d6afff SHA-1: b3ed169f63f15beb852e38e4f66c07d3a226fa4b SHA-256: 94bdf5dc6126281034c9946a1025158ba3ea89ecb4b918a0b91cd21e4e8315b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and other potentially malicious PDF files, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted from this sample, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://sam-global.info/files/file/dapexawodemegagugudid.pdf
    • http://altaprecision.com/userfiles/file/69655836965.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5df9d18f6---sogasapumapamodagajelupis.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/khj528dlvp043q61p4gqlhdd82/ziludog.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/rii18vb1udr51dgidcii66ka30/pidob.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3767b946da85679018ed6c5f64ecc6ff/sevopag.pdf
    • https://kidneystonetreatment.in/userfiles/files/pesulopid.pdf
    • http://fly.no1-yes.com/userfiles/file/zebigafapewofezat.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/28412231677.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/71031392654.pdf
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/295472163.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b06480089---89205105636.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc7436ff6---25648593399.pdf
    • https://aldurra.ly/images-editeur/img/file/40022698262.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/4b04f8a12715e24c41f9fa4b3ecc812a/38978727942.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e800084ba8---vemadepelogexulagazafagat.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/408f831444ae1b25dff5f2f2dbd74375/39619184618.pdf
    • https://acgroupenterprise.com/userfiles/file/zaremigixexu.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b6a2baf0d59f361cbb61df7ff44c1eed/kokosagipavabudanidutokun.pdf
    • https://landi-bg.com/images/file/tovapurozofamudoj.pdf
    • http://budka39.ru/files/bixulubedi.pdf
    • http://agcslohian.com/userfiles/file/patosop.pdf
    • http://beerskiboot.de/img/upload/file/bidezutimekorov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+make+a+calendar+schedule+in+excel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2d.bin
7f24d0eb2dc7a741df0fd0afbe6233126981ef4ab3005198054b1e56bab8074b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 11008 bytes
font_01_sfnt_off0001048a.bin
638e4ef5635840ef2aab91ef7c916eedb8f532ce7ecc80cc57fdb7f5f05ae74e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 17156 bytes
font_02_sfnt_off00013107.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13107 16792 bytes