Malicious PDF — malware analysis report

Static analysis result for SHA-256 c640411d4219b103…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 14:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29ea69e851bbc382fccdd1fae7bf7bfe SHA-1: f640027ab0a1c706c63a90f2215c9248d47925d8 SHA-256: c640411d4219b103e85fcf68c376dbe8aa58a8152cb1dc636f45669c6db8b0bf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160742796514b7---37738029187.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f94b12ad4ed65601cc0bf2dfd49ac58e/5538679818.pdf
    • http://dichvutot99.com/webroot/img/files/37625987957.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e32aa513f---42290495007.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/k8a7hgde7t3t12ksdi7nald5g0/xawipixemupijomudodubiw.pdf
    • http://veraschwemmle.de/fckdata/file/dovujonotulomotop.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hnch7q7hsqhjg6qlvnvq5qimt2/wiruje.pdf
    • https://hzautomatisering.nl/userfiles/file/35160043761.pdf
    • https://superchills.com/userfiles/file/45339358157.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b222d1dc6d---ponawix.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/p2oer0vgvnk4n2codcqoqo0ti3/jarirodufifosi.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b453d4769ce---juxonafirizunuwoman.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/686634a3ad531bd1b3204c553b251860/bozenopamubuxulupefala.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9c323e59c40d61f8f3f4d704ec8d2e2f/fowediretosiluwam.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c871304e04---37809448963.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c072ce5478e---11224503047.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/216331dd1e587908b8905e280f3d5155/vapoxu.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dafea0a6b3---69417061425.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f43b9855df88aab9f43c67a8d401210a/21775170825.pdf
    • https://goldenapp.net/file/sunazisej.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3415055db8---lobavaxanav.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcde13c936---70289494890.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=do+i+get+time+and+a+half+on+easter+sunday
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6cc.bin
9947ba82c6f124430824f0212ff1d4ca844f4e168dfdff5e3f0e3552a48d3320
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 17096 bytes
font_01_sfnt_off000113ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 16792 bytes
font_02_sfnt_off00012c05.bin
38ed1e558fe066ed831270ad9d6986096d0d136292a1351dcda27b5cde72e464
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C05 11016 bytes