Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a6f12eaa9c33c7…

MALICIOUS

PDF

103.9 KB Created: 2021-07-23 20:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fa7f1fdd36f0f329aada84ebc2212fe7 SHA-1: 7346eb10d81a966a3ba297a49ac48792169670f8 SHA-256: b1a6f12eaa9c33c76a0c44e78531fc3ed112e162750be4f4b55dfd4353f76ad0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16097e4fed1c53---99247341641.pdf In PDF document text
    • http://uptownchantilly.com/uploads/files/tagitikijomisipa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b053cecc2f7---tiwaw.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021061500130473499.pdfIn PDF document text
    • https://luminex.pl/upload/file/momutunido.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dc9d61a27---jupugogorefi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabbdcd015e---2118848254.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/xukuzajulejififusinozo.pdfIn PDF document text
    • http://arslanemlak.com/E/file/14254409295.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/sesugoj.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a71e9ed75---kimap.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/zimifefatun.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a22afc7fb87---sozoseduv.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff2e18681---54479567360.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/d366110af57ea70d6bb0da953ea84b5c/gagakudufoxeramiwemikaw.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/wezomofiwe.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/favovazenotawesi.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/87392868960.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/bilega.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7171c8d8af---boxagabenobapiberitas.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/kixotuvakufewuragawexug.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/57796494855.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/51868045820.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/40954459007.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160941d47ebfd3---kapejukimobema.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/35553624146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=que+son+los+medios+de+comunicacion+oral+para+ni%C3%B1osPDF 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_off00012b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14362 10940 bytes
SHA-256: 5a59c9ceb1d7e0ae64f25b58af4b4248315468a24d3a04325cd5de7ab5c96bbb
font_02_sfnt_off00015c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7B 19576 bytes
SHA-256: 5a6ff197714e1dbdafd963ae453a63acb2f309040b0755083e1ef43a8e825b4c