Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ff0ff1de1d81c3…

MALICIOUS

PDF

119.1 KB Created: 2021-06-28 08:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 57dd7f9c8cfa01ba27ca213649014005 SHA-1: eae710fb570915b647d586df8f3293ecd1687be0 SHA-256: a8ff0ff1de1d81c338868732c8ba68c2c90a60462a204337324fe88824df1925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL heuristics are sufficient to infer a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9732

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://bouveau-consulting.com/userfiles/file/tojiloxatalijikod.pdf In PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/19687458924.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9499da8985---76711485573.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/54219440928.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca45917b38---sakezutenovo.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40a80ed83---68983639642.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2baet70h8i4aemqsqjne156bp0/24666716045.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/5784100647.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a343cbaa60d---kasiripudekiniwe.pdfIn PDF document text
    • http://industrialdevices.in/uploads/texakexe.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b7386f38a---ganuponemajibom.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f127e055fd---vufaz.pdfIn PDF document text
    • https://csodamalom.hu/files/files/25931183574.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e88dc65d---gewumiridogimobifewax.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa2e916f95---kebitojoku.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6398a96bd---mejazalozigolajulesarono.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085332690955---lusazanawiraxefeput.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a74e02ed31---petixewos.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/jidarul.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad292be0f0c---21089143168.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160731f01069f4---4168581286.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/wudemen.pdfIn PDF document text
    • http://aven.su/userfiles/file/45753151145.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/b4p4vnciisvebcdog5m99ulk5e/79830868495.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a278e6579ab---ronujabobapenub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=angry+at+or+withPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001855e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1855E 25960 bytes
SHA-256: 97a01a6ea468fa8c156cea71c740fff249f378db8eba85001c459492e67d5475
font_00_sfnt_off0001118a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118A 6364 bytes
SHA-256: 835af30dddaec405f83d6e5d294b72771d8b34534b28ba96148118f034680137
font_01_sfnt_off0001279c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279C 10220 bytes
SHA-256: d4e152997b842f46bcf8c44856130f7bf4f2c98db416849a4719ded54d70be21
font_02_sfnt_off00013e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E89 30512 bytes
SHA-256: 2b1f1b20fddb50c4f19cc8b77af7b6da6b8999016d88e5e8f12b3add7019750b
font_04_sfnt_off0001b61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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