Malicious PDF — malware analysis report

Static analysis result for SHA-256 192766efce64b459…

MALICIOUS

PDF

90.6 KB Created: 2021-09-04 23:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f5db5f873191666fd3ec142c1f6c9dd SHA-1: 5d9960ddf7b10f4bca4989e2cfdbe32997640740 SHA-256: 192766efce64b4590af38079f14f1ec94dccdd310d6c833907f0a63fee3836e7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external links, some pointing to IP addresses and compromised CMS uploads, suggesting an attempt to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript indicates a likely intent to execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://moyamoya.center/images/hand_uploaded/files/ziremapupopu.pdf In PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610071fe86839---43409470171.pdfIn PDF document text
    • https://btegypt.com/file/44430836923.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/kemijaximozirupux.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/klkdig9ua0mtgnt1uk9opa5r76/96156656877.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/41582220869.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d6a963d82051122dbee32255c7161734/77239692250.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1626392584.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e089a3e102876f86ec5ae6ff18c29f4f/dupolupojalijegotu.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210713042313.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/pegowadovajo.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/fivaladotaroxiforepuw.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/d275e94e63f64905ede0ae153061d1ea/lelazumerezimugukavova.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/14433633471.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/nemasamujata.pdfPDF link annotation
    • http://webinside.pl/userfiles/file/99207012981.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/vedorulenuvoju.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/88126943812.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e9a14f7d3e36fa28d14ef9a45b2bb4db/dewuxexetubej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=interpreta%C3%A7%C3%A3o+de+texto+concurso+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_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 11092 bytes
SHA-256: 2fc0f6d4793eff6c59ee1f08ff24be4760e0cfb7627e5488c175fdd54e7e57f6
font_01_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 21996 bytes
SHA-256: bfe22cc59573701b64755d6504c228d95c1c5001ed139668a6c2c50286c0d157

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