Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a6f5f33e734962…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 05:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6d644a9a9687db3dd7ff57d2224c0db SHA-1: 8bd194643469a5a7a700d69db5b463bb6bae6052 SHA-256: a1a6f5f33e734962245f355b72e650119d4b10d59454cfb52d9e9295b8b311b8
96 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple link farm heuristics suggests an attempt to obscure the ultimate destination or distribute malicious content across various sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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://jocoseatee.com/userfiles/files/22358381494.pdf In PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/14205309834.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/4892210088.pdfIn PDF document text
    • https://rm-parketi.si/uploads/jafobegaratexeboduvepi.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/1931238989.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717e39dce37---66134070520.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/87485385583.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a23ab9b7257---95573622915.pdfIn PDF document text
    • http://446888.top/userfiles/file/namubobe.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/lebesetowoxexodopenuni.pdfIn PDF document text
    • http://dnepropress.net/files/file/futemebapo.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/97186418141.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/vodabelajuboxepomu.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/pekajidoguzerasa.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/pazonawofaronula.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/50586976082.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7f9df758d962fedbab76d130de75d081/56465802263.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f382e7e94---kukanigitipi.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/59918094586.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/88651306969.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/ganofijumesale.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/nibagarowuvolakababijiw.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5co5a21n0l1k23ko2ch1t3jho5/36654107506.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/35878929394.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/53478747942.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/62069096371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sea+monsters+on+medieval+and+renaissance+maps+pdfPDF 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_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 10924 bytes
SHA-256: 2e653dda3073813e735474de892dd7ae1f649279db222a652068540028a5b787
font_01_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 18160 bytes
SHA-256: 09be72cb9e2e7a899bb849e6883257d2d8e1f399e6de3493c09ddd861711a25b