Malicious PDF — malware analysis report

Static analysis result for SHA-256 428cb0f0aa7c6e6a…

MALICIOUS

PDF

92.9 KB Created: 2021-08-03 06:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: fa62a6263769a56645666b618079187a SHA-1: fc3f0ff6d62373bf535b3e11557c7189bba0c729 SHA-256: 428cb0f0aa7c6e6a74a95b0a4e1d0a055e0bc659b4b67ab42746c64ae837bbb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous compromised WordPress sites, likely intended to lure users into downloading malicious content or engaging in phishing activities. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 6

  • 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.
  • 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://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046b640a11---56834701119.pdf In PDF document text
    • http://brezov-gaj.si/uporabnik/file/13331774233.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e3db060c---69573168791.pdfIn PDF document text
    • https://ivaco.it/file/820912627.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/3323607943.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/nokejorabovusi.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/kojumugigadiwazojakew.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9f61d61ca26f17764698490802e62503/resoxebewewuzawidibeg.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/74653207309.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/fibewozobewew.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/mepubakezobofobenolur.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/dopido.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7e3296b7---kiveji.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5s78m9hft6730guji60oepahda/vujekimijitijirusite.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dfaecf0973d---wimujovikuxosusebewesesok.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/boruxesomadarim.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/kidabojawexu.pdfIn PDF document text
    • http://protok.pro/upload/files/jinanovez.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607318084a337---50796836481.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/9487203464.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/4371350958.pdfIn PDF document text
    • http://teplospectr.ru/images/files/67259851571.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/068bbcabb7c61cfd3f19ce3db424f25a/ladaburosijilamesasagefe.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/nebexotilag.pdfIn PDF document text
    • http://canadanur.com/resimler/files/11634607916.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161036ed5ba0a3---petafumofezuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=example+ielts+writing+task+2+band+7PDF 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_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 11188 bytes
SHA-256: cda40f4a750b801f1962365cba6512745b720470710a30ea7477375a60b7bdf3
font_01_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 16892 bytes
SHA-256: ecccdd3701aef3af4836886d20a4bb984e1c25866ac9da8f2ac837cfdc9838f6
font_02_sfnt_off00014c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1