Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58b3decc2f98d33…

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 07:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 91a613ec6bee691343a501f08e5fbcf8 SHA-1: f8d9b75190d005fc255c7d7e0ed59d8c3ad24bee SHA-256: a58b3decc2f98d337c165a6e52bfef7349f78b99b2eb59863bd62fd4a57253b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The presence of numerous external URIs and link farms suggests an effort to obscure the ultimate malicious destination or to distribute various payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=packet+in+data+communication PDF link annotation
    • http://gd-weimi.com/upfolder/e/files/20210529131427.pdfIn PDF document text
    • http://gptools.net/userfiles/file/mubefoverajili.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/5307100199.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/40987292093.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/816daccd5a3033e2bcde55edb3f5e73f/xivanu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3b699b8bf---83460880765.pdfIn PDF document text
    • https://123natura.com/stockages/files/mejufivolizopumuxawaxipa.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/c3a8b369cf5e3aacdebc3e0e63bdb31e/kogesosexuxa.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607074be4b994---kirusafelajeluxazof.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/725bd03dc77bd16c73bd9b006db5360b/bedijekenezoloxujagabe.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/73qe56j7tld8n64eg5e8oje3go/mixilubufefuwilebi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/k859nrq2fbbk3jltmpm3kfmvom/95879445580.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/18862642689.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/aoafr13h0ceb6lmol04585dv27/demamewujezusenatiwebeg.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7159f20a2d---kegurepafetusoronar.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/1697073.pdfIn PDF document text
    • http://polletnv.be/uploads/files/dujuxusutorawas.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/gonedonobebeludude.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/be84cc39a7b1edb7419ff226e94058bb/didavenifik.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/15946090659.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a3ebabca---gobigu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f67830084a---sorojowixudegufugupu.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/4a9464ef8b38fc22041e018a93ad9b5f/tobasasatepetekidi.pdfIn PDF document text
    • 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_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 16724 bytes
SHA-256: f600ed57d78a868cb1cfe11e951c45a1d6ffcfb22893d2085768804b47a05b19
font_02_sfnt_off00012f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F79 10412 bytes
SHA-256: 695ee4bd33092330b2dce0832c59a5c4d7303bb74bc5535d85487b6cad24bfd1

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