Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19a2e036d87b66b…

MALICIOUS

PDF

86.7 KB Created: 2021-09-01 03:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85d867160a38e03036c2e735a637bc1a SHA-1: 4743e495795f91813700e796c64aceb4b7dd5be3 SHA-256: e19a2e036d87b66b8498e2e89571d39190875ffbc94b383012d2d49d2dbf3eb3
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to external resources, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document may instruct users to install remote support tools, a common tactic for gaining unauthorized access. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/cf0b2cf14fdb47463bd24377236e7f11/xuletapegalijokadiz.pdf In PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/wokorosi.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/mexarijasusimufep.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/20542799412.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba51380c7---99498276962.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/gevofugakolevo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/59844277939.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/98938029517.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/47372079335.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/u8tk7f20n2q3e833afn2a00eu2/97920671757.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2765c1df1a1c790f54bca02dbef34032/44081894510.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/75635974229.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/34761707334.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/kenoloxatakuwasobas.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/75f561b466ca5f656892985361df114a/ninomasufugeleridoj.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/47238985515.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/45500434783.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca2c068d1c---55478567288.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/7qi000d53btgini4an2va8f9ni/75042221257.pdfIn PDF document text
    • https://blugarden.eu/file/22944464931.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a056ee00a3c1b123180011fb4ba82e52/90043686347.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/17041677795.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/29035352325.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f4650dc91---kavemevuwipigo.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/26098636386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+pdf+for+mobile+androidPDF 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_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 17732 bytes
SHA-256: 7d0c3748d3b3f638088d6fb33a387c89954a3bf6f4751cce0cce5862633dc2ad
font_02_sfnt_off0001341b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341B 10620 bytes
SHA-256: 0e2d37c119f9c94c006c5c255f97e2b09582a9bc7fc58e313545c9264f3dd13c

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