Malicious PDF — malware analysis report

Static analysis result for SHA-256 898c1507ce3cde13…

MALICIOUS

PDF

95.3 KB Created: 2021-07-29 21:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbfc6a130b443340c87fe55befde94d9 SHA-1: fa33db6967921cc3dd1541541ef909b587264b23 SHA-256: 898c1507ce3cde131f7f3ed5b61dfdb1721f8906dc3b5560b9e2424f0560f259
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on disposable domains or compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://uniquecharacters.com/upload/files/42104715419.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c7819223cba---33740759526.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/bajugajijuwetuz.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d82fbd324b---witegopigoputosexe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/84637965922.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bf1f69843fbd33949af64dc095c8e943/zozemazaxixex.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/5693498585.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/losomujalir.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/75698477587.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/46338232842.pdfIn PDF document text
    • http://dzbnf.com/upload/file///pimusevirekozifadu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a09d8e1c1d4---54839794099.pdfIn PDF document text
    • https://udruga-invalida.hr/files/5012832341.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/fudofifiweruzaxavi.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05cabecb9---pipenodufuluba.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/xuxudajinanodokepixazoj.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/33438070851.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/31992158273.pdfIn PDF document text
    • http://envigest.cz/upload/file/xixekibakejemotonozowub.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/womijareloruseleriguru.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ceedb7ea5---jegulogufuralinag.pdfIn PDF document text
    • http://z500.si/files/gavokafebivapirefawuw.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/54716719984dffcf17d3c24c1d936b73/42187690066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=working+principle+of+capacitive+level+sensorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 10808 bytes
SHA-256: 5575413585ecc1869a36762945d377db3acc3854c9684604429897916c51bcac
font_01_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 16292 bytes
SHA-256: 2af8bbaac440bc5fbcca647849d9c057f4f1dc4fe73e3154b3eebe9cc81f1e67
font_02_sfnt_off00014eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAA 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
font_03_sfnt_off000156ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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