Malicious PDF — malware analysis report

Static analysis result for SHA-256 4450169d0c2becd3…

MALICIOUS

PDF

78.8 KB Created: 2021-07-24 19:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d7609ceab6fca5753dbd47f543a0e89d SHA-1: ebc7e18e35d85a52066bdd80b4cab9fd8d088761 SHA-256: 4450169d0c2becd37cf76b0cec71aa516241546f84db47416dc10bce1c18bbc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to various compromised WordPress sites, likely intended to redirect users to phishing pages or download further malware. No scripts were extracted, but the presence of numerous external links suggests a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bce095702f0edf4fb9b714d568b888ac/ximozakuzedetit.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb0179620---vazokafemu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace783b2470---xutorotoxunadabapekidabe.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/061ec1a9121712d6a461d51a5fbb18aa/41979555696.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949a21186a3---4997753245.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/4def6hivs1ol0j3h3k18jft94v/62838256771.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/79756496974.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/nuvatebanobumuwakoku.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/7imm6l0l22s574em3usg238ag1/69931114620.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/tovife.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/12910935754.pdfIn PDF document text
    • https://langumeistras.lt/i/File/dizididejukut.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160719492751f2---xoxixatugerobuxuromoxo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8d3297b22effb1a100908d37d7bf0662/50464285770.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/87136603731.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/tuxezujeborelofigi.pdfIn PDF document text
    • http://moffatcountyhighschool65.com/clients/878592/File/wamadokemamex.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/55136401077.pdfIn PDF document text
    • http://vhshf.de/File/vadumogul.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/chktiodjljnch92cp14vgld2bv/fozojid.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd388a29b6---730398620.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/96477523534.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/befebepidugutuvam.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/dazagu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21cfc90ff7---badepaxonigovilema.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/lenosolememusunilila.pdfIn PDF document text
    • http://allycatering.com/userfiles/60439575796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=armitron+wr+165+ft+watch+instructionsPDF 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_off0000ce4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 17308 bytes
SHA-256: 780736ef52623ad116f1215c79dfeb2befc79ab718e9e2b86c0f9ba76f8bbaf4
font_02_sfnt_off000113e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 10944 bytes
SHA-256: 05d8bf79a01892422d432aa727d1c4bf1e1694aa52d1e683d4d3c24497ba0f2a