Malicious PDF — malware analysis report

Static analysis result for SHA-256 352e97a8b00cbff3…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 16:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5018c11bc51d0f6e0fdf8f31ea3e8fb3 SHA-1: 3e084d8ac5708d9c96047804ef7944d995ce5418 SHA-256: 352e97a8b00cbff374a49007a99ec61c85e4f193883c6b166662daf3b3e76d5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://coretry.ru/uplcv?utm_term=millennial+manual+transmission PDF link annotation
    • http://koddous.com/userfiles/file/66421369507.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/26518724914.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/88371078281.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bda3d3c540---87264637813.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cefda1b20---wefivutisosegobolo.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021070220595373499.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pmuv65p83mrd24u8m6qg77hvdm/lorewupobogefitaxom.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070c95116692---kevabiravam.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/40649778294.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/50ff7d3c824d650c029a29e7e14db920/tilerizuse.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/dibolajulusowud.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/fe316te13oq7uadq33pcg9g053/rijawawagokinuraz.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/82722729943.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/46955834450.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4e20ba54---42116418643.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af696914d3a---xidozezijoridaxodifejig.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72ffb66436---befekakonaxizenogadig.pdfIn PDF document text
    • http://gptools.net/userfiles/file/24922131753.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609138a870178---lupasawixikil.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/robumosekok.pdfIn PDF document text
    • https://faprosid.com/file/mexanubumuguj.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3432c50be45d0fb92a7006fbae09b155/felavaselivuxufaxekum.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/62787973604.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f0bcc0d8---vixogopaponof.pdfIn PDF document text
    • https://advik.net/userfiles/file/65301603611.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/jegikededuju.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_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 10364 bytes
SHA-256: 2c6cfa6ee050f77daaff739df1d1de069743e1700b92e8828357fab75422d71e
font_01_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 18440 bytes
SHA-256: 6891796a30dc4ece636db5066095a8375a7a8d095485d118412dbc8120eed50a

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